{"id":"CVE-2026-110247","published":"2026-10-13T19:18:49.493","lastModified":"2026-10-13T19:30:29.797","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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2071621","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}