{"id":"CVE-2026-110247","aliases":[],"title":"Integer overflow in libmime buffer growth could lead to heap corruption","titleSource":"mozilla","descriptionSource":"mozilla","products":[{"vendor":"Mozilla","name":"Thunderbird","platforms":[],"versions":[{"version":"153.6","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"158","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}],"source":"mozilla","url":"https://www.cve.org/CVERecord?id=CVE-2026-110247"}],"remediation":[],"description":"Several buffer-growth sites in libmime performed size arithmetic in 32-bit types without overflow checks. On a sufficiently large message the growth guard could fail open, or the buffer could be reallocated smaller than required, and a subsequent memcpy would then write attacker-controlled data across adjacent heap allocations. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.6.","severity":"unknown","score":null,"published":"2026-10-13T18:08:37.608Z","modified":"2026-10-27T18:27:45.455Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2071621","https://www.mozilla.org/security/advisories/mfsa2026-109/","https://www.mozilla.org/security/advisories/mfsa2026-122/"],"sources":[{"name":"CVE","id":"CVE-2026-110247","modified":"2026-10-27T18:27:45.455Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-110247"}],"assessments":[],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T15:45:31.007Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}