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CVE-2026-110247

8.4 high SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 8

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-27 18:27
  2. References+1 references (now 3)NVD modified 2026-10-27 19:17
  3. StatusPublished → Awaiting AnalysisNVD modified 2026-10-27 19:17
  4. 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.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.
    NVD modified 2026-10-27 19:17
  5. StatusAwaiting Analysis → PublishedNVD modified 2026-10-20 17:09
  6. CwesCWE-190NVD modified 2026-10-20 18:17
  7. CVSS8.4 (v3.1, CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)NVD modified 2026-10-20 18:17
  8. First seenunscoredNVD modified 2026-10-13 19:30

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3