Hi,

The following vulnerability was published for mkvtoolnix.

CVE-2026-90783[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-90783
https://www.cve.org/CVERecord?id=CVE-2026-90783
[1] https://codeberg.org/mbunkus/mkvtoolnix/commit/1495126138e086080f0163bee27fafbdf956a1d0

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore