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CVE-2026-90783NVD
Description
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.
CVSS Base Metrics
CVSS v3 (3.1)
HIGH 7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4 (4.0)
HIGH 8.5
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weaknesses (CWE)
CWE-680 - Integer Overflow to Buffer Overflow
Affected & Patched Versions
| Product | Affected Versions | Patched Version |
|---|---|---|
| Moritz Bunkus MKVToolNix | 0 - <= 101.0 | 1495126138e086080f0163bee27fafbdf956a1d0 |
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