CVE-2026-90783 MKVToolNix - Remote Code Execution

MKVToolNix through 101.0 contains a heap buffer overflow caused by integer wraparound in 32-bit arithmetic in the avilib library's ODML superindex parser, letting attackers execute arbitrary code via crafted AVI files, exploit requires file parsing.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.20% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
13 September 2026
Updated
15 October 2026
Weakness
CWE-680

Vendor fix

Update to the latest version beyond 101.0.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs