Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
References
- https://codeberg.org/mbunkus/mkvtoolnix
- https://codeberg.org/mbunkus/mkvtoolnix/commit/1495126138e086080f0163bee27fafbdf
- https://codeberg.org/mbunkus/mkvtoolnix/src/tag/release-101.0/lib/avilib-0.6.10/
- https://www.vulncheck.com/advisories/mkvtoolnix-through-101.0-heap-buffer-overfl
FAQ
What is CVE-2026-90783?
CVE-2026-90783 is a vulnerability with a CVSS score of 7.8 (HIGH). 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...
How severe is CVE-2026-90783?
CVE-2026-90783 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-90783?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.