{ "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-2026-27459", "tracking": { "current_release_date": "2026-03-27T21:41:15.992445Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-27459", "initial_release_date": "2026-03-16T16:43:01.092504Z", "revision_history": [ { "date": "2026-03-16T16:43:01.092504Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-16T16:43:03.279367Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-17T23:38:33.840919Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-17T23:38:38.186361Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-18T00:25:23.331218Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-18T00:25:28.367389Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-03-18T12:44:33.753821Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (2)." }, { "date": "2026-03-18T12:44:35.872826Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-18T16:02:11.284918Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-18T20:38:47.296408Z", "number": "10", "summary": "Unknown change." }, { "date": "2026-03-19T00:28:04.690713Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (33).| Product Identifiers created (13).| Product Remediations created (46).| Products created (13).| References created (5).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-19T00:28:21.144714Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-19T12:20:06.302899Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CWES updated (1)." }, { "date": "2026-03-19T15:31:26.924100Z", "number": "14", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-19T15:31:29.957638Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:41:02.684372Z", "number": "16", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T18:22:02.716951Z", "number": "17", "summary": "Products connected (2)." }, { "date": "2026-03-20T19:56:09.268596Z", "number": "18", "summary": "References created (1)." }, { "date": "2026-03-21T12:19:58.957780Z", "number": "19", "summary": "Product Remediations created (1)." }, { "date": "2026-03-21T12:20:02.820235Z", "number": "20", "summary": "NCSC Score updated." }, { "date": "2026-03-24T10:15:33.654377Z", "number": "21", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| Product Identifiers created (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-24T10:15:40.990045Z", "number": "22", "summary": "NCSC Score updated." }, { "date": "2026-03-25T17:25:18.125263Z", "number": "23", "summary": "Products created (1).| Product Identifiers created (1).| Products removed (1)." }, { "date": "2026-03-25T17:25:24.748406Z", "number": "24", "summary": "NCSC Score updated." }, { "date": "2026-03-27T21:40:55.046060Z", "number": "25", "summary": "NCSC Score updated." } ], "status": "interim", "version": "25" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/2", "product": { "name": "vers:rpm/2", "product_id": "CSAFPID-1508257", "product_identification_helper": { "cpe": "cpe:/a:redhat:ansible_automation_platform:2" } } } ], "category": "product_name", "name": "Red Hat Ansible Automation Platform 2" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/2", "product": { "name": "vers:rpm/2", "product_id": "CSAFPID-3023480", "product_identification_helper": { "cpe": "cpe:/a:redhat:ansible_core:2" } } } ], "category": "product_name", "name": "Red Hat Ansible Automation Platform Ansible Core 2" }, { "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", 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"vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5355695" } } ], "category": "product_name", "name": "quay-rhel9" } ], "category": "product_family", "name": "Red Hat Quay 3" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5874051", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:azl3_pyopenssl_24.2.1-1:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "azl3 pyOpenSSL 24.2.1-1 on Azure Linux 3.0" }, { "branches": [ { "category": "product_version_range", "name": "vers:microsoft/*", "product": { "name": "vers:microsoft/*", "product_id": "CSAFPID-5874052", "product_identification_helper": { "cpe": "cpe:2.3:a:microsoft:cbl2_pyopenssl_18.0.0-8:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "cbl2 pyOpenSSL 18.0.0-8 on CBL Mariner 2.0" } ], "category": "product_family", "name": "Open Source Software" } ], "category": "vendor", "name": "Microsoft" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=22.0.0|<26.0.0", "product": { "name": "vers:unknown/>=22.0.0|<26.0.0", "product_id": "CSAFPID-5906992", "product_identification_helper": { "cpe": "cpe:2.3:a:pyopenssl:pyopenssl:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "pyOpenSSL" } ], "category": "vendor", "name": "pyOpenSSL" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5843889" } } ], "category": "product_name", "name": "pyopenssl" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-5843890" } } ], "category": "product_name", "name": "pyopenssl" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=22.0.0|<26.0.0", "product": { "name": "vers:unknown/>=22.0.0|<26.0.0", "product_id": "CSAFPID-5839524" } } ], "category": "product_name", "name": "pyopenssl" } ], "category": "vendor", "name": "pyca" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-27459", "cwe": { "id": "CWE-120", "name": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')" }, "notes": [ { "category": "description", "text": "If a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer.\n\nCookie values that are too long are now rejected.", "title": "github - https://api.github.com/advisories/GHSA-5pwr-322w-8jr4" }, { "category": "description", "text": "If a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer.\n\nCookie values that are too long are now rejected.", "title": "github - https://github.com/advisories/GHSA-5pwr-322w-8jr4" }, { "category": "description", "text": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-27459" }, { "category": "description", "text": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-27459" }, { "category": "description", "text": "pyOpenSSL DTLS cookie callback buffer overflow", "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "description", "text": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-27459" }, { "category": "description", "text": "A flaw was found in pyOpenSSL. The set_cookie_generate_callback callback function can be used to generate DTLS cookies. When the callback returns a cookie string or byte sequence longer than 256 bytes, a buffer overflow can be triggered due to a missing bounds checking before copying the data to a fixed-size buffer provided by the underlying OpenSSL library.\nThis flaw is only exploitable when an application using the pyOpenSSL library provides a custom callback to the set_cookie_generate_callback function. For the buffer overflow to occur, the callback function must return a cookie string or byte sequence longer than 256 bytes, limiting the exposure of this issue. Due to these reasons, this vulnerability has been rated with an important severity.", "title": "redhat - https://access.redhat.com/security/cve/CVE-2026-27459" }, { "category": "description", "text": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-27459" }, { "category": "other", "text": "0.0004", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U", "title": "CVSSV4" }, { "category": "other", "text": "7.2", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.3", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, VENDOR FIX as product remediation category", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to a product by vendor Red Hat, There is product_remediation data available from source Redhat", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 3\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5839524", "CSAFPID-5843889", "CSAFPID-5843890", "CSAFPID-1439279", "CSAFPID-1439313", "CSAFPID-1441200", "CSAFPID-1441204", "CSAFPID-1455906", "CSAFPID-1508257", "CSAFPID-1508261", "CSAFPID-1508264", "CSAFPID-1771989", "CSAFPID-2518221", "CSAFPID-2698058", "CSAFPID-2698059", "CSAFPID-2976378", "CSAFPID-3023480", "CSAFPID-3093049", "CSAFPID-4534157", "CSAFPID-5008757", "CSAFPID-5008758", "CSAFPID-5009266", "CSAFPID-5119831", "CSAFPID-5172458", "CSAFPID-5172459", "CSAFPID-5172461", "CSAFPID-5355695", "CSAFPID-5811359", "CSAFPID-5846025", "CSAFPID-5846026", "CSAFPID-5846027", "CSAFPID-5846029", "CSAFPID-5846039", "CSAFPID-5846040", "CSAFPID-5846041", "CSAFPID-5874051", "CSAFPID-5874052", "CSAFPID-5906992" ], "known_not_affected": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439321", "CSAFPID-1439328", "CSAFPID-1441193", "CSAFPID-1441197", "CSAFPID-2855768", "CSAFPID-5276235", "CSAFPID-5846030", "CSAFPID-5846032", "CSAFPID-5846033", "CSAFPID-5846035", "CSAFPID-5846036", "CSAFPID-5846037" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-5pwr-322w-8jr4" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-5pwr-322w-8jr4" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-27459" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/27xxx/CVE-2026-27459.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27459" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-27459" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-27459" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-27459" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/security/cve/CVE-2026-27459" }, { "category": "external", "summary": "Source raw - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-27459.json" }, { "category": "external", "summary": "Source - microsoft", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-5pwr-322w-8jr4" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-27459" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; redhat", "url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; redhat", "url": "https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; redhat", "url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-5pwr-322w-8jr4" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-27459" }, { "category": "external", "summary": "Reference - github; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27459" } ], "remediations": [ { "category": "mitigation", "details": "To mitigate this flaw, ensure the callback provided to the set_cookie_generate_callback function strictly limits the returned cookie string or byte sequence to under 256 bytes.", "product_ids": [ "CSAFPID-1439279", "CSAFPID-1439313", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439321", "CSAFPID-1439328", "CSAFPID-1441193", "CSAFPID-1441197", "CSAFPID-1441200", "CSAFPID-1441204", "CSAFPID-1455906", "CSAFPID-1508257", "CSAFPID-1508261", "CSAFPID-1508264", "CSAFPID-1771989", "CSAFPID-2518221", "CSAFPID-2698058", "CSAFPID-2698059", "CSAFPID-2855768", "CSAFPID-2976378", "CSAFPID-3023480", "CSAFPID-3093049", "CSAFPID-4534157", "CSAFPID-5008757", "CSAFPID-5008758", "CSAFPID-5009266", "CSAFPID-5119831", "CSAFPID-5172458", "CSAFPID-5172459", "CSAFPID-5172461", "CSAFPID-5276235", "CSAFPID-5355695", "CSAFPID-5811359", "CSAFPID-5846025", "CSAFPID-5846026", "CSAFPID-5846027", "CSAFPID-5846029", "CSAFPID-5846030", "CSAFPID-5846032", "CSAFPID-5846033", "CSAFPID-5846035", "CSAFPID-5846036", "CSAFPID-5846037", "CSAFPID-5846039", "CSAFPID-5846040", "CSAFPID-5846041" ] }, { "category": "vendor_fix", "details": "CBL-Mariner Releases", "product_ids": [ "CSAFPID-5874051" ] } ], "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-1439279", "CSAFPID-1439313", "CSAFPID-1441200", "CSAFPID-1441204", "CSAFPID-1455906", "CSAFPID-1508257", "CSAFPID-1508261", "CSAFPID-1508264", "CSAFPID-1771989", "CSAFPID-2518221", "CSAFPID-2698058", "CSAFPID-2698059", "CSAFPID-2976378", "CSAFPID-3023480", "CSAFPID-3093049", "CSAFPID-4534157", "CSAFPID-5008757", "CSAFPID-5008758", "CSAFPID-5009266", "CSAFPID-5119831", "CSAFPID-5172458", "CSAFPID-5172459", "CSAFPID-5172461", "CSAFPID-5355695", "CSAFPID-5811359", "CSAFPID-5839524", "CSAFPID-5843889", "CSAFPID-5843890", "CSAFPID-5846025", "CSAFPID-5846026", "CSAFPID-5846027", "CSAFPID-5846029", "CSAFPID-5846039", "CSAFPID-5846040", "CSAFPID-5846041", "CSAFPID-5874051", "CSAFPID-5874052", "CSAFPID-5906992" ] } ], "title": "CVE-2026-27459" } ] }