{"id":"CVE-2026-109729","title":"Use-after-free in the JavaScript Engine: JIT component","summary":"Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","cwe":["CWE-416","CWE-825"],"published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T19:18:36.833","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109729","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2074632","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-107/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-110/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109729.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-109729"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2550420"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-109729"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109729"}],"tags":["nvd","csaf","vex","red-hat","cve.org","score-dispute"],"ingestedAt":"2026-10-13T13:27:03.999Z","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9"],"scores":{"nvd":5.4,"vendor":8.8,"adp":5.4},"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-13T14:13:31.130568Z"},"slug":"CVE-2026-109729","body":"## Overview\n\nUse-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-13 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109729.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":219751,"id":"CVE-2026-109729","ts":1791905694554,"field":"cvss","old":null,"new":"5.4"},{"seq":219750,"id":"CVE-2026-109729","ts":1791905694554,"field":"severity","old":"none","new":"medium"}]}