CVE-2026-110247
High · 8.4CVSS
8.4
EPSS
0.2%
Published
Oct 13, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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