CVE-2026-110247

01/תיאור (מקור, אנגלית)

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.

02/קישורים3

• bugzilla.mozilla.org/show_bug.cgi?id=2071621
• www.mozilla.org/security/advisories/mfsa2026-109/
• www.mozilla.org/security/advisories/mfsa2026-122/