{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-4721", "tracking": { "current_release_date": "2026-04-02T15:16:44.504559Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-4721", "initial_release_date": "2026-03-24T20:49:16.476211Z", "revision_history": [ { "date": "2026-03-24T20:49:16.476211Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| Products connected (3).| References created (4)." }, { "date": "2026-03-24T20:49:22.033775Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-24T20:49:35.941695Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (4)." }, { "date": "2026-03-24T20:53:11.878311Z", "number": "4", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products created (1).| Products connected (4).| References created (1).| Vendor_assessment created." }, { "date": "2026-03-24T20:54:37.178678Z", "number": "5", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products connected (5).| References created (1).| Vendor_assessment created." }, { "date": "2026-03-24T20:55:26.738670Z", "number": "6", "summary": "Description removed for source.| Description created for source.| Products connected (2).| References created (2)." }, { "date": "2026-03-24T20:55:30.648105Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-24T21:19:33.837074Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-24T21:28:50.789743Z", "number": "9", "summary": "Description removed for source.| Description created for source.| References created (2)." }, { "date": "2026-03-25T00:22:41.458459Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products connected (5).| References created (1).| Vendor_assessment created." }, { "date": "2026-03-25T00:43:40.079408Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Products connected (2)." }, { "date": "2026-03-25T00:43:43.363136Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-25T03:25:00.991911Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-03-25T04:39:03.046758Z", "number": "14", "summary": "Unknown change." }, { "date": "2026-03-25T06:43:40.679784Z", "number": "15", "summary": "Description created for source." }, { "date": "2026-03-25T12:43:28.248263Z", "number": "16", "summary": "Products connected (2)." }, { "date": "2026-03-25T13:16:58.993724Z", "number": "17", "summary": "Source connected.| CVE status created. (valid)| Products connected (5).| References created (7)." }, { "date": "2026-03-25T13:17:01.427680Z", "number": "18", "summary": "NCSC Score updated." }, { "date": "2026-03-25T13:38:58.803698Z", "number": "19", "summary": "CVSS created.| CWES updated (1)." }, { "date": "2026-03-25T13:39:06.784619Z", "number": "20", "summary": "NCSC Score updated." }, { "date": "2026-03-25T14:25:42.745442Z", "number": "21", "summary": "CVSS created.| CWES updated (1)." }, { "date": "2026-03-25T14:25:48.648784Z", "number": "22", "summary": "NCSC Score updated." }, { "date": "2026-03-25T20:53:57.410851Z", "number": "23", "summary": "Products connected (5).| Product Identifiers created (5)." }, { "date": "2026-03-25T20:53:59.634480Z", "number": "24", "summary": "NCSC Score updated." }, { "date": "2026-03-26T00:43:38.906530Z", "number": "25", "summary": "Products connected (1).| Product Identifiers created (1).| Products removed (1)." }, { "date": "2026-03-26T00:46:57.702207Z", "number": "26", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-26T01:30:40.528657Z", "number": "27", "summary": "NCSC Score updated." }, { "date": "2026-03-26T08:07:05.240128Z", "number": "28", "summary": "Products connected (2).| References created (2)." }, { "date": "2026-03-26T08:07:08.254252Z", "number": "29", "summary": "NCSC Score updated." }, { "date": "2026-03-27T00:33:50.102389Z", "number": "30", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Remediations created (4).| Product Identifiers created (13).| Product Identifiers removed (13).| References created (45).| CWES updated (1)." }, { "date": "2026-03-27T00:34:01.715431Z", "number": "31", "summary": "NCSC Score updated." }, { "date": "2026-03-27T00:35:18.432661Z", "number": "32", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (5).| Product Remediations created (5).| Product Identifiers created (17).| Product Identifiers removed (17).| References created (45).| CWES updated (1)." }, { "date": "2026-03-27T00:36:31.290090Z", "number": "33", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Remediations created (4).| Product Identifiers created (13).| Product Identifiers removed (13).| References created (45).| CWES updated (1)." }, { "date": "2026-03-27T00:43:22.714919Z", "number": "34", "summary": "Products connected (3).| Product Identifiers created (3).| Products removed (3)." }, { "date": "2026-03-27T00:43:24.695544Z", "number": "35", "summary": "NCSC Score updated." }, { "date": "2026-03-27T09:06:11.508684Z", "number": "36", "summary": "Products connected (1).| References created (6)." }, { "date": "2026-03-27T09:06:13.554326Z", "number": "37", "summary": "NCSC Score updated." }, { "date": "2026-03-29T08:29:51.040052Z", "number": "38", "summary": "NCSC Score updated." }, { "date": "2026-03-30T13:22:38.463834Z", "number": "39", "summary": "Products connected (2).| References created (5)." }, { "date": "2026-03-30T13:22:40.718717Z", "number": "40", "summary": "NCSC Score updated." }, { "date": "2026-03-31T00:39:42.146728Z", "number": "41", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Remediations created (4).| Product Identifiers created (13).| Product Identifiers removed (13).| References created (47).| CWES updated (1)." }, { "date": "2026-03-31T00:39:45.658932Z", "number": "42", "summary": "NCSC Score updated." }, { "date": "2026-03-31T11:06:19.831625Z", "number": "43", "summary": "References created (2)." }, { "date": "2026-04-01T11:42:17.235252Z", "number": "44", "summary": "References created (1)." }, { "date": "2026-04-02T00:33:48.475247Z", "number": "45", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Remediations created (4).| Product Identifiers created (13).| Product Identifiers removed (13).| References created (47).| CWES updated (1)." }, { "date": "2026-04-02T12:19:44.746047Z", "number": "46", "summary": "References created (5)." }, { "date": "2026-04-02T12:19:47.712775Z", "number": "47", "summary": "NCSC Score updated." } ], "status": "interim", "version": "47" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1295663", "product_identification_helper": { "cpe": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "Debian Linux" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/140.9.0esr-1~deb12u1", "product": { "name": "vers:deb/140.9.0esr-1~deb12u1", "product_id": "CSAFPID-5913138", "product_identification_helper": { "purl": "pkg:deb/debian/firefox-esr@140.9.0esr-1~deb12u1?distro=bookworm" } } } ], "category": "product_name", "name": "firefox-esr" }, { "branches": [ { "category": "product_version_range", "name": "vers:deb/1:140.9.0esr-1~deb12u1", "product": { "name": "vers:deb/1:140.9.0esr-1~deb12u1", "product_id": "CSAFPID-5920681", "product_identification_helper": { "purl": "pkg:deb/debian/thunderbird@1:140.9.0esr-1~deb12u1?distro=bookworm" } } } ], "category": "product_name", "name": "thunderbird" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/140.9.0esr-1~deb11u1", "product": { "name": "vers:deb/140.9.0esr-1~deb11u1", "product_id": "CSAFPID-5920680", "product_identification_helper": { "purl": "pkg:deb/debian/firefox-esr@140.9.0esr-1~deb11u1?distro=bullseye" } } } ], "category": "product_name", "name": "firefox-esr" }, { "branches": [ { "category": "product_version_range", "name": "vers:deb/1:140.9.0esr-1~deb11u1", "product": { "name": "vers:deb/1:140.9.0esr-1~deb11u1", "product_id": "CSAFPID-5920682", "product_identification_helper": { "purl": "pkg:deb/debian/thunderbird@1:140.9.0esr-1~deb11u1?distro=bullseye" } } } ], "category": "product_name", "name": "thunderbird" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/149", "product": { "name": "vers:unknown/149", "product_id": "CSAFPID-5902760" } }, { "category": "product_version_range", "name": "vers:unknown/<149", "product": { "name": "vers:unknown/<149", "product_id": "CSAFPID-5906272" } }, { "category": "product_version_range", "name": "vers:unknown/unspecified|<149", "product": { "name": "vers:unknown/unspecified|<149", "product_id": "CSAFPID-5902330" } } ], "category": "product_name", "name": "Firefox" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/115.34", "product": { "name": "vers:unknown/115.34", "product_id": "CSAFPID-5902762" } }, { "category": "product_version_range", "name": "vers:unknown/140.9", "product": { "name": "vers:unknown/140.9", "product_id": "CSAFPID-5902754" } }, { "category": "product_version_range", "name": "vers:unknown/<115.34", "product": { "name": "vers:unknown/<115.34", "product_id": "CSAFPID-5906270" } }, { "category": "product_version_range", "name": "vers:unknown/<140.9", "product": { "name": "vers:unknown/<140.9", "product_id": "CSAFPID-5906271" } }, { "category": "product_version_range", "name": "vers:unknown/unspecified|<115.34", "product": { "name": "vers:unknown/unspecified|<115.34", "product_id": "CSAFPID-5902340" } }, { "category": "product_version_range", "name": "vers:unknown/unspecified|<140.9", "product": { "name": "vers:unknown/unspecified|<140.9", "product_id": "CSAFPID-5902331" } } ], "category": "product_name", "name": "Firefox ESR" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/149", "product": { "name": "vers:unknown/149", "product_id": "CSAFPID-5902761" } }, { "category": "product_version_range", "name": "vers:unknown/<149", "product": { "name": "vers:unknown/<149", "product_id": "CSAFPID-5906268" } }, { "category": "product_version_range", "name": "vers:unknown/esr <140.9", "product": { "name": "vers:unknown/esr <140.9", "product_id": "CSAFPID-5906269" } }, { "category": "product_version_range", "name": "vers:unknown/unspecified|<140.9", "product": { "name": "vers:unknown/unspecified|<140.9", "product_id": "CSAFPID-5902808" } }, { "category": "product_version_range", "name": "vers:unknown/unspecified|<149", "product": { "name": "vers:unknown/unspecified|<149", "product_id": "CSAFPID-5902807" } } ], "category": "product_name", "name": "Thunderbird" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/140.9", "product": { "name": "vers:unknown/140.9", "product_id": "CSAFPID-5902759" } } ], "category": "product_name", "name": "Thunderbird ESR" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<115.34.0", "product": { "name": "vers:unknown/<115.34.0", "product_id": "CSAFPID-5902500", "product_identification_helper": { "cpe": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/<149.0", "product": { "name": "vers:unknown/<149.0", "product_id": "CSAFPID-5902501", "product_identification_helper": { "cpe": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=128.0|<140.9.0", "product": { "name": "vers:unknown/>=128.0|<140.9.0", "product_id": "CSAFPID-5902502", "product_identification_helper": { "cpe": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*" } } } ], "category": "product_name", "name": "firefox" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<140.9.0", "product": { "name": "vers:unknown/<140.9.0", "product_id": "CSAFPID-5906754", "product_identification_helper": { "cpe": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/<149.0", "product": { "name": "vers:unknown/<149.0", "product_id": "CSAFPID-5906755", "product_identification_helper": { "cpe": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*" } } } ], "category": "product_name", "name": "thunderbird" } ], "category": "vendor", "name": "Mozilla" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1317177", "product_identification_helper": { "cpe": "cpe:/o:oracle:linux:-" } } } ], "category": "product_name", "name": "Oracle Linux" } ], "category": "vendor", "name": "Oracle" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1317175", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:-" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/10.1", "product": { "name": "vers:rpm/10.1", "product_id": "CSAFPID-5180289", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:10.1" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux AppStream (v. 10)" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1432908", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:8::appstream" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux AppStream (v. 8)" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/9", "product": { "name": "vers:rpm/9", "product_id": "CSAFPID-1432758", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:9::appstream" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux AppStream (v. 9)" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el10_1", "product": { "name": "vers:rpm/140.9.0-1.el10_1", "product_id": "CSAFPID-5920619", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox@140.9.0-1.el10_1?arch=x86_64" } } }, { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el8_10", "product": { "name": "vers:rpm/140.9.0-1.el8_10", "product_id": "CSAFPID-5920626", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox@140.9.0-1.el8_10?arch=x86_64" } } }, { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el9_7", "product": { "name": "vers:rpm/140.9.0-1.el9_7", "product_id": "CSAFPID-5920622", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox@140.9.0-1.el9_7?arch=x86_64" } } } ], "category": "product_name", "name": "firefox" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el10_1", "product": { "name": "vers:rpm/140.9.0-1.el10_1", "product_id": "CSAFPID-5920620", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox-debuginfo@140.9.0-1.el10_1?arch=x86_64" } } }, { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el8_10", "product": { "name": "vers:rpm/140.9.0-1.el8_10", "product_id": "CSAFPID-5920627", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox-debuginfo@140.9.0-1.el8_10?arch=x86_64" } } }, { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el9_7", "product": { "name": "vers:rpm/140.9.0-1.el9_7", "product_id": "CSAFPID-5920623", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox-debuginfo@140.9.0-1.el9_7?arch=x86_64" } } } ], "category": "product_name", "name": "firefox-debuginfo" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el10_1", "product": { "name": "vers:rpm/140.9.0-1.el10_1", "product_id": "CSAFPID-5920621", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox-debugsource@140.9.0-1.el10_1?arch=x86_64" } } }, { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el8_10", "product": { "name": "vers:rpm/140.9.0-1.el8_10", "product_id": "CSAFPID-5920628", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox-debugsource@140.9.0-1.el8_10?arch=x86_64" } } }, { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el9_7", "product": { "name": "vers:rpm/140.9.0-1.el9_7", "product_id": "CSAFPID-5920624", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox-debugsource@140.9.0-1.el9_7?arch=x86_64" } } } ], "category": "product_name", "name": "firefox-debugsource" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el9_7", "product": { "name": "vers:rpm/140.9.0-1.el9_7", "product_id": "CSAFPID-5920625", "product_identification_helper": { "purl": "pkg:rpm/redhat/firefox-x11@140.9.0-1.el9_7?arch=x86_64" } } } ], "category": "product_name", "name": "firefox-x11" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el10_1", "product": { "name": "vers:rpm/140.9.0-1.el10_1", "product_id": "CSAFPID-5983402", "product_identification_helper": { "purl": "pkg:rpm/redhat/thunderbird@140.9.0-1.el10_1?arch=x86_64" } } }, { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el9_7", "product": { "name": "vers:rpm/140.9.0-1.el9_7", "product_id": "CSAFPID-5966237", "product_identification_helper": { "purl": "pkg:rpm/redhat/thunderbird@140.9.0-1.el9_7?arch=x86_64" } } } ], "category": "product_name", "name": "thunderbird" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el10_1", "product": { "name": "vers:rpm/140.9.0-1.el10_1", "product_id": "CSAFPID-5983403", "product_identification_helper": { "purl": "pkg:rpm/redhat/thunderbird-debuginfo@140.9.0-1.el10_1?arch=x86_64" } } }, { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el9_7", "product": { "name": "vers:rpm/140.9.0-1.el9_7", "product_id": "CSAFPID-5966238", "product_identification_helper": { "purl": "pkg:rpm/redhat/thunderbird-debuginfo@140.9.0-1.el9_7?arch=x86_64" } } } ], "category": "product_name", "name": "thunderbird-debuginfo" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el10_1", "product": { "name": "vers:rpm/140.9.0-1.el10_1", "product_id": "CSAFPID-5983404", "product_identification_helper": { "purl": "pkg:rpm/redhat/thunderbird-debugsource@140.9.0-1.el10_1?arch=x86_64" } } }, { "category": "product_version_range", "name": "vers:rpm/140.9.0-1.el9_7", "product": { "name": "vers:rpm/140.9.0-1.el9_7", "product_id": "CSAFPID-5966239", "product_identification_helper": { "purl": "pkg:rpm/redhat/thunderbird-debugsource@140.9.0-1.el9_7?arch=x86_64" } } } ], "category": "product_name", "name": "thunderbird-debugsource" } ], "category": "product_family", "name": "Red Hat Enterprise Linux" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1317176", "product_identification_helper": { "cpe": "cpe:/o:suse:opensuse:-" } } } ], "category": "product_name", "name": "SUSE openSUSE" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/unknown", "product": { "name": "vers:unknown/unknown", "product_id": "CSAFPID-1317174", "product_identification_helper": { "cpe": "cpe:/o:suse:suse_linux:-" } } } ], "category": "product_name", "name": "SuSE Linux" } ], "category": "vendor", "name": "SUSE" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-4721", "cwe": { "id": "CWE-120", "name": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')" }, "notes": [ { "category": "description", "text": "Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.", "title": "mozilla - https://www.mozilla.org/en-US/security/advisories/mfsa2026-22/" }, { "category": "description", "text": "Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.", "title": "mozilla - https://www.mozilla.org/en-US/security/advisories/mfsa2026-21/" }, { "category": "description", "text": "Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4721.json" }, { "category": "description", "text": "Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4721" }, { "category": "description", "text": "Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.", "title": "mozilla - https://www.mozilla.org/en-US/security/advisories/mfsa2026-24/" }, { "category": "description", "text": "Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-4721" }, { "category": "description", "text": "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nMemory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:5931.json" }, { "category": "description", "text": "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nMemory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:5930.json" }, { "category": "description", "text": "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nMemory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:5932.json" }, { "category": "description", "text": "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nMemory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:6188.json" }, { "category": "description", "text": "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nMemory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:6342.json" }, { "category": "other", "text": "8e-05", "title": "EPSS" }, { "category": "other", "text": "5.1", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde, VENDOR FIX as product remediation category", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is product_remediation data available from source Redhat", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" } ], "product_status": { "first_fixed": [ "CSAFPID-5913138", "CSAFPID-5920680", "CSAFPID-5920681", "CSAFPID-5920682" ], "fixed": [ "CSAFPID-5902754", "CSAFPID-5902759", "CSAFPID-5902760", "CSAFPID-5902761", "CSAFPID-5902762", "CSAFPID-5920619", "CSAFPID-5920620", "CSAFPID-5920621", "CSAFPID-5920622", "CSAFPID-5920623", "CSAFPID-5920624", "CSAFPID-5920625", "CSAFPID-5920626", "CSAFPID-5920627", "CSAFPID-5920628", "CSAFPID-5966237", "CSAFPID-5966238", "CSAFPID-5966239", "CSAFPID-5983402", "CSAFPID-5983403", "CSAFPID-5983404" ], "known_affected": [ "CSAFPID-5902330", "CSAFPID-5902331", "CSAFPID-5902340", "CSAFPID-5902807", "CSAFPID-5902808", "CSAFPID-5906268", "CSAFPID-5906269", "CSAFPID-5906270", "CSAFPID-5906271", "CSAFPID-5906272", "CSAFPID-5902500", "CSAFPID-5902501", "CSAFPID-5902502", "CSAFPID-5906754", "CSAFPID-5906755", "CSAFPID-1295663", "CSAFPID-1317176", "CSAFPID-1317175", "CSAFPID-1317174", "CSAFPID-1317177" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4721.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4721" }, { "category": "external", "summary": "Source - mozilla", "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-22/" }, { "category": "external", "summary": "Source - mozilla", "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-21/" }, { "category": "external", "summary": "Source - mozilla", "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-24/" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-4721" }, { "category": "external", "summary": "Source - hkcert", "url": "https://www.hkcert.org/security-bulletin/mozilla-products-multiple-vulnerabilities_20260325" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0850.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:5931.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:5930.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:5932.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:6188.json" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/csaf/RHSA-2026:6342.json" }, { "category": "external", "summary": "Reference - cveprojectv5; mozilla; nvd", "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=2013762%2C2015291%2C2016591%2C2016661%2C2016664%2C2017303%2C2017894%2C2018090%2C2018196%2C2018379%2C2019112%2C2022090%2C2022243%2C2022351%2C2022478%2C2022676" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://www.mozilla.org/security/advisories/mfsa2026-20/" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://www.mozilla.org/security/advisories/mfsa2026-21/" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://www.mozilla.org/security/advisories/mfsa2026-22/" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://www.mozilla.org/security/advisories/mfsa2026-23/" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://www.mozilla.org/security/advisories/mfsa2026-24/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0850.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0850" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-20/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-21/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-22/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-23/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-24/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/Y7M6NU74R4Q7BLCQHUTUH3DFSFTPCPKT/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.debian.org/debian-security-announce/2026/msg00087.html" }, { "category": "external", "summary": "Reference - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-4721" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450711" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-4721" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4721" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.mozilla.org/security/advisories/mfsa2026-22/#CVE-2026-4721" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.mozilla.org/security/advisories/mfsa2026-24/#CVE-2026-4721" }, { "category": "external", "summary": "Reference - certbundde; redhat", "url": "https://access.redhat.com/errata/RHSA-2026:5931" }, { "category": "external", "summary": "Reference - redhat", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450710" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450712" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450713" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450714" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450715" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450718" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450719" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450720" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450721" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450722" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450723" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450724" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450725" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450726" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450727" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450728" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450729" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450730" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450732" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450733" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450734" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450735" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450738" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450739" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450740" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450741" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450742" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450744" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450746" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450747" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450748" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450751" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450752" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450755" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450756" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450757" }, { "category": "external", "summary": "Reference - redhat", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_5931.json" }, { "category": "external", "summary": "Reference - certbundde; redhat", "url": "https://access.redhat.com/errata/RHSA-2026:5930" }, { "category": "external", "summary": "Reference - redhat", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_5930.json" }, { "category": "external", "summary": "Reference - certbundde; redhat", "url": "https://access.redhat.com/errata/RHSA-2026:5932" }, { "category": "external", "summary": "Reference - redhat", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_5932.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.debian.org/debian-security-announce/2026/msg00088.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.debian.org/debian-lts-announce/2026/03/msg00014.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.debian.org/debian-lts-announce/2026/03/msg00015.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-March/025023.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-March/025022.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://linux.oracle.com/errata/ELSA-2026-5930.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://linux.oracle.com/errata/ELSA-2026-5931.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://linux.oracle.com/errata/ELSA-2026-5932.html" }, { "category": "external", "summary": "Reference - certbundde; redhat", "url": "https://access.redhat.com/errata/RHSA-2026:6188" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451001" }, { "category": "external", "summary": "Reference - redhat", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451006" }, { "category": "external", "summary": "Reference - redhat", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_6188.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://linux.oracle.com/errata/ELSA-2026-6188.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/ELMKS2KLVJGOTFRHFX4CFYYGKJCR3ZFX/" }, { "category": "external", "summary": "Reference - certbundde; redhat", "url": "https://access.redhat.com/errata/RHSA-2026:6342" }, { "category": "external", "summary": "Reference - redhat", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_6342.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://linux.oracle.com/errata/ELSA-2026-6342.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-April/025116.html" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/YYCV757JWWKCAIP63ZNZ7UWNGGZJPRIV/" }, { "category": "external", "summary": "Reference - certbundde", "url": "http://linux.oracle.com/errata/ELSA-2026-6342.html" } ], "remediations": [ { "category": "vendor_fix", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "CSAFPID-5180289", "CSAFPID-5920619", "CSAFPID-5920620", "CSAFPID-5920621" ], "restart_required": { "category": "none" }, "url": "https://access.redhat.com/errata/RHSA-2026:5931" }, { "category": "vendor_fix", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "CSAFPID-1432758", "CSAFPID-5920622", "CSAFPID-5920623", "CSAFPID-5920624", "CSAFPID-5920625" ], "restart_required": { "category": "none" }, "url": "https://access.redhat.com/errata/RHSA-2026:5930" }, { "category": "vendor_fix", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "CSAFPID-1432908", "CSAFPID-5920626", "CSAFPID-5920627", "CSAFPID-5920628" ], "restart_required": { "category": "none" }, "url": "https://access.redhat.com/errata/RHSA-2026:5932" }, { "category": "vendor_fix", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "CSAFPID-1432758", "CSAFPID-5966237", "CSAFPID-5966238", "CSAFPID-5966239" ], "restart_required": { "category": "none" }, "url": "https://access.redhat.com/errata/RHSA-2026:6188" }, { "category": "vendor_fix", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "CSAFPID-5180289", "CSAFPID-5983402", "CSAFPID-5983403", "CSAFPID-5983404" ], "restart_required": { "category": "none" }, "url": "https://access.redhat.com/errata/RHSA-2026:6342" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-1295663", "CSAFPID-1317174", "CSAFPID-1317175", "CSAFPID-1317176", "CSAFPID-1317177", "CSAFPID-5902330", "CSAFPID-5902331", "CSAFPID-5902340", "CSAFPID-5902500", "CSAFPID-5902501", "CSAFPID-5902502", "CSAFPID-5902807", "CSAFPID-5902808", "CSAFPID-5906268", "CSAFPID-5906269", "CSAFPID-5906270", "CSAFPID-5906271", "CSAFPID-5906272", "CSAFPID-5906754", "CSAFPID-5906755" ] } ], "title": "CVE-2026-4721" } ] }