CVE-2026-90783
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
MKVToolNix through 101.0 contains a heap buffer overflow in the bundled avilib library's ODML superindex parser due to integer wraparound in 32-bit arithmetic. Attackers can craft a malicious AVI file with oversized entry counts that cause an undersized heap allocation, allowing a heap buffer overflow when the file is parsed with mkvmerge.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Moritz Bunkus | MKVToolNix | 0 <= 101.0 | affected |
| Moritz Bunkus | MKVToolNix | 1495126138e086080f0163bee27fafbdf956a1d0 | unaffected |
Weaknesses
- CWE-680: Integer Overflow to Buffer Overflow
References
- https://codeberg.org/mbunkus/mkvtoolnix/commit/1495126138e086080f0163bee27fafbdf956a1d0
- https://codeberg.org/mbunkus/mkvtoolnix/src/tag/release-101.0/lib/avilib-0.6.10/avilib.c#L2552-L2570
- https://codeberg.org/mbunkus/mkvtoolnix
- https://www.vulncheck.com/advisories/mkvtoolnix-through-101.0-heap-buffer-overflow-via-avilib-odml-superindex-integer-wraparound
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