{"id":"CVE-2026-109740","state":"PUBLISHED","title":"Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component","description":"Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.","publishedAt":"2026-10-13T12:29:26.143Z","updatedAt":"2026-10-19T11:52:04.550Z","severity":{"score":9.6,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"mozilla","products":["Mozilla Firefox","Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"153.5","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"158","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"153.5","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"158","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2057113","https://www.mozilla.org/security/advisories/mfsa2026-106/","https://www.mozilla.org/security/advisories/mfsa2026-108/","https://www.mozilla.org/security/advisories/mfsa2026-109/","https://www.mozilla.org/security/advisories/mfsa2026-110/"],"weaknesses":["CWE-119"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/109xxx/CVE-2026-109740.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-109740","state":"PUBLISHED","datePublished":"2026-10-13T12:29:26.143Z","dateUpdated":"2026-10-19T11:52:04.550Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2026-10-13T00:29:46.134Z"},"containers":{"cna":{"title":"Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component","descriptions":[{"lang":"en","value":"Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5."}],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"153.5","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"158","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"153.5","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"158","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2057113"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-110/"}],"providerMetadata":{"shortName":"mozilla","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateUpdated":"2026-10-13T18:17:03.396Z"},"credits":[{"lang":"en","value":"Mozilla"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":9.6,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-10-19T11:51:05.678002Z","id":"CVE-2026-109740","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-119","type":"CWE","lang":"en","description":"CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T11:52:04.550Z"}}]}}}