{"id":"CVE-2026-117891","state":"PUBLISHED","title":"Use-after-free in the JavaScript Engine: JIT component","description":"Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.","publishedAt":"2026-10-27T14:05:13.894Z","updatedAt":"2026-10-27T18:28:28.523Z","severity":null,"assigner":"mozilla","products":["Mozilla Firefox","Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"115.44","status":"unaffected","lessThanOrEqual":"115.*","versionType":"rpm"},{"version":"153.6","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"159","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"153.6","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"159","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2078837","https://www.mozilla.org/security/advisories/mfsa2026-118/","https://www.mozilla.org/security/advisories/mfsa2026-119/","https://www.mozilla.org/security/advisories/mfsa2026-120/","https://www.mozilla.org/security/advisories/mfsa2026-121/","https://www.mozilla.org/security/advisories/mfsa2026-122/"],"weaknesses":[],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/117xxx/CVE-2026-117891.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-117891","state":"PUBLISHED","datePublished":"2026-10-27T14:05:13.894Z","dateUpdated":"2026-10-27T18:28:28.523Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2026-10-27T14:05:13.729Z"},"containers":{"cna":{"title":"Use-after-free in the JavaScript Engine: JIT component","descriptions":[{"lang":"en","value":"Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6."}],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"115.44","status":"unaffected","lessThanOrEqual":"115.*","versionType":"rpm"},{"version":"153.6","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"159","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"153.6","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"159","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2078837"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-118/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-119/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-120/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-121/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-122/"}],"providerMetadata":{"shortName":"mozilla","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateUpdated":"2026-10-27T18:28:28.523Z"},"credits":[{"lang":"en","value":"Mozilla"}]}}}}