CVE-2026-90783
MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparound
- State
- Published
- Severity
- 8.5 High
- Published
- Sep 13, 2026
- Updated
- Sep 30, 2026
- Reserved
- Sep 13, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.5 High | 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 | VulnCheck |
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-680 Integer Overflow to Buffer Overflow
Affected Products
| Product | Versions |
|---|---|
MKVToolNixMoritz Bunkus |
|
References
- Patch Commitpatch
- Unchecked video superindex allocation in avi_parse_input_file() at release-101.0technical-description
- https://codeberg.org/mbunkus/mkvtoolnixproduct
- VulnCheck Advisory: MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparoundthird-party-advisory
- https://lists.debian.org/debian-lts-announce/2026/09/msg00040.html
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