{ "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-2026-4726", "tracking": { "current_release_date": "2026-04-02T12:31:22.073239Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-4726", "initial_release_date": "2026-03-24T20:49:02.869291Z", "revision_history": [ { "date": "2026-03-24T20:49:02.869291Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| Products connected (1).| References created (2)." }, { "date": "2026-03-24T20:49:05.189809Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-24T20:49:36.957858Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (2)." }, { "date": "2026-03-24T20:54:10.965623Z", "number": "4", "summary": "Description removed for source.| Description created for source.| Products connected (1).| References created (1)." }, { "date": "2026-03-24T20:54:26.216037Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-24T21:19:23.226628Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-24T21:29:02.237910Z", "number": "7", "summary": "Description removed for source.| Description created for source.| References created (1)." }, { "date": "2026-03-25T00:43:39.621097Z", "number": "8", "summary": "Source created.| CVE status created. (valid)" }, { "date": "2026-03-25T03:25:13.675528Z", "number": "9", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-03-25T06:44:04.350441Z", "number": "10", "summary": "Description created for source." }, { "date": "2026-03-25T12:27:50.732965Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (11).| Product Identifiers created (5).| References created (3).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-25T12:28:04.352645Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-25T13:17:03.231752Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)| Products connected (5).| References created (7)." }, { "date": "2026-03-25T13:17:06.377062Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-25T18:39:08.609584Z", "number": "15", "summary": "CVSS created.| CWES updated (1).| Unknown change." }, { "date": "2026-03-25T18:39:10.886882Z", "number": "16", "summary": "NCSC Score updated." }, { "date": "2026-03-25T19:28:56.676912Z", "number": "17", "summary": "CVSS created.| CWES updated (1)." }, { "date": "2026-03-25T19:29:06.782405Z", "number": "18", "summary": "NCSC Score updated." }, { "date": "2026-03-25T21:25:48.415825Z", "number": "19", "summary": "Products connected (2).| Product Identifiers created (2)." }, { "date": "2026-03-25T21:25:55.283136Z", "number": "20", "summary": "NCSC Score updated." }, { "date": "2026-03-26T00:46:56.455450Z", "number": "21", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-26T08:07:09.739166Z", "number": "22", "summary": "Products connected (2).| References created (2)." }, { "date": "2026-03-26T08:07:12.559800Z", "number": "23", "summary": "NCSC Score updated." }, { "date": "2026-03-27T09:06:15.630923Z", "number": "24", "summary": "Products connected (1).| References created (6)." }, { "date": "2026-03-27T09:06:17.782227Z", "number": "25", "summary": "NCSC Score updated." }, { "date": "2026-03-30T13:22:42.846458Z", "number": "26", "summary": "Products connected (2).| References created (5)." }, { "date": "2026-03-30T13:22:45.345498Z", "number": "27", "summary": "NCSC Score updated." }, { "date": "2026-03-31T11:06:24.697979Z", "number": "28", "summary": "References created (2)." }, { "date": "2026-04-01T11:42:22.415001Z", "number": "29", "summary": "References created (1)." }, { "date": "2026-04-02T12:19:49.608803Z", "number": "30", "summary": "References created (5)." }, { "date": "2026-04-02T12:31:04.525809Z", "number": "31", "summary": "NCSC Score updated." } ], "status": "interim", "version": "31" } }, "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:12.0:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "Debian Linux" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "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-5906270" } }, { "category": "product_version_range", "name": "vers:unknown/<140.9", "product": { "name": "vers:unknown/<140.9", "product_id": "CSAFPID-5906271" } } ], "category": "product_name", "name": "Firefox ESR" }, { "branches": [ { "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|<149", "product": { "name": "vers:unknown/unspecified|<149", "product_id": "CSAFPID-5902807" } } ], "category": "product_name", "name": "Thunderbird" }, { "branches": [ { "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_name", "name": "firefox" }, { "branches": [ { "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": [ { "category": "product_version_range", "name": "vers:rpm/10", "product": { "name": "vers:rpm/10", "product_id": "CSAFPID-2858634", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:10" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/6", "product": { "name": "vers:rpm/6", "product_id": "CSAFPID-1439321", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:6" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 6" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/7", "product": { "name": "vers:rpm/7", "product_id": "CSAFPID-1439315", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:7" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/8", "product": { "name": "vers:rpm/8", "product_id": "CSAFPID-1439317", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:8" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/9", "product": { "name": "vers:rpm/9", "product_id": "CSAFPID-1439319", "product_identification_helper": { "cpe": "cpe:/a:redhat:enterprise_linux:9" } } } ], "category": "product_name", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2873478" } } ], "category": "product_name", "name": "firefox" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2873479" } } ], "category": "product_name", "name": "firefox-flatpak" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1692245" } } ], "category": "product_name", "name": "firefox" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 6" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459356" } } ], "category": "product_name", "name": "firefox" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459357" } } ], "category": "product_name", "name": "firefox" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1459360" } } ], "category": "product_name", "name": "firefox" } ], "category": "product_family", "name": "Red Hat Enterprise Linux 9" } ], "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-2026-4726", "cwe": { "id": "CWE-776", "name": "Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')" }, "notes": [ { "category": "description", "text": "Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-4726" }, { "category": "description", "text": "Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4726.json" }, { "category": "description", "text": "Denial-of-service in the XML component. This vulnerability affects Firefox < 149 and Thunderbird < 149.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4726" }, { "category": "description", "text": "A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:\nDenial-of-service in the XML component\nRed Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4726.json" }, { "category": "other", "text": "5e-05", "title": "EPSS" }, { "category": "other", "text": "5.5", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is cvss data available from source Redhat, Is related to CWE-404 (Improper Resource Shutdown or Release)", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 1\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5902330", "CSAFPID-5902807", "CSAFPID-5906268", "CSAFPID-5906269", "CSAFPID-5906270", "CSAFPID-5906271", "CSAFPID-5906272", "CSAFPID-5902501", "CSAFPID-5906755", "CSAFPID-1295663", "CSAFPID-1317176", "CSAFPID-1317175", "CSAFPID-1317174", "CSAFPID-1317177" ], "known_not_affected": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-1459356", "CSAFPID-1459357", "CSAFPID-1459360", "CSAFPID-1692245", "CSAFPID-2858634", "CSAFPID-2873478", "CSAFPID-2873479" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4726.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-4726" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-4726" }, { "category": "external", "summary": "Source - hkcert", "url": "https://www.hkcert.org/security-bulletin/mozilla-products-multiple-vulnerabilities_20260325" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4726.json" }, { "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": "Reference - cveprojectv5; nvd", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1955311" }, { "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/mfsa2026-23/" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-4726" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4726" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.mozilla.org/security/advisories/mfsa2026-20/#CVE-2026-4726" }, { "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 - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:5932" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:5931" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://access.redhat.com/errata/RHSA-2026:5930" }, { "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", "url": "https://access.redhat.com/errata/RHSA-2026:6188" }, { "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", "url": "https://access.redhat.com/errata/RHSA-2026:6342" }, { "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" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1295663", "CSAFPID-1317174", "CSAFPID-1317175", "CSAFPID-1317176", "CSAFPID-1317177", "CSAFPID-5902330", "CSAFPID-5902501", "CSAFPID-5902807", "CSAFPID-5906268", "CSAFPID-5906269", "CSAFPID-5906270", "CSAFPID-5906271", "CSAFPID-5906272", "CSAFPID-5906755" ] } ], "title": "CVE-2026-4726" } ] }