CVE-2026-90783CWE-680

CVE-2026-90783

High · published September 13, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
9.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
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
EPSS
0.00202 · 9.5th percentile
Weakness
CWE-680 · Integer Overflow to Buffer Overflow
Published
2026-09-13T17:16Z
References (5)
https://codeberg.org/mbunkus/mkvtoolnix · [email protected]https://codeberg.org/mbunkus/mkvtoolnix/commit/1495126138e086080f0163bee27fafbdf956a1d0 · [email protected]https://codeberg.org/mbunkus/mkvtoolnix/src/tag/release-101.0/lib/avilib-0.6.10/avilib.c#L2552-L2570 · [email protected]https://www.vulncheck.com/advisories/mkvtoolnix-through-101.0-heap-buffer-overflow-via-avilib-odml-superindex-integer-wraparound · [email protected]https://lists.debian.org/debian-lts-announce/2026/09/msg00040.html · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 15 SEP 03:22Z
    EPSS moved — → 0%
    epss
  • 13 SEP 12:22Z
    MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparound
    cvelistv5