CVE catalog

CVE-2026-90783

Severity: High · CVSS 8.5CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Sep 13, 2026, 12:22:02 PM UTC
Updated: Sep 13, 2026, 1:16:29 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.20% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	mkvtoolnix	sid	`103.0-1`	fixed
Debian	mkvtoolnix	forky	`103.0-1`	fixed
Debian	mkvtoolnix	trixie	`92.0-1`	vulnerable
Debian	mkvtoolnix	trixie-security	`92.0-1+deb13u1`	fixed
Debian	mkvtoolnix	bookworm	`74.0.0-1`	vulnerable
Debian	mkvtoolnix	bookworm-security	`74.0.0-1+deb12u1`	fixed
Opensuse	mkvtoolnix	leap 16.0	`95.0-bp160.2.1`	fixed
Opensuse	mkvtoolnix	tumbleweed	`101.0-2.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	mkvtoolnix	source	sid	`101.0-2`	not yet assigned	Not reported	[1147621]
Debian	mkvtoolnix	source	forky	`101.0-2`	not yet assigned	Not reported	[1147621]
Debian	mkvtoolnix	source	trixie	`92.0-1+deb13u1`	not yet assigned	Not reported	[1147621]
Debian	mkvtoolnix	source	bookworm	`74.0.0-1+deb12u1`	not yet assigned	Not reported	[1147621]
Opensuse	mkvtoolnix	rpm	leap 16.0	`95.0-bp160.2.1`	Not reported	OPENSUSE-SU-2026:21867-1	Not reported
Opensuse	mkvtoolnix	rpm	tumbleweed	`101.0-2.1`	Not reported	OPENSUSE-SU-2026:11779-1	Not reported

[Debian bug #1147621]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[mkvtoolnix]Affected
Details (2)
- 74.0.0-1 · amd64 · bookworm
  Affected · Fixed: 74.0.0-1+deb12u1
  nvd · mkvtoolnix · debian · bookworm; nvd · mkvtoolnix · debian · 12
- 74.0.0-1 · arm64 · bookworm
  Affected · Fixed: 74.0.0-1+deb12u1
  nvd · mkvtoolnix · debian · bookworm; nvd · mkvtoolnix · debian · 12
[mkvtoolnix-gui]Affected
Source package: [mkvtoolnix]
Details (2)
- 74.0.0-1 · amd64 · bookworm
  Affected · Fixed: 74.0.0-1+deb12u1
  nvd · mkvtoolnix · debian · bookworm; nvd · mkvtoolnix · debian · 12
- 74.0.0-1 · arm64 · bookworm
  Affected · Fixed: 74.0.0-1+deb12u1
  nvd · mkvtoolnix · debian · bookworm; nvd · mkvtoolnix · debian · 12

[Debian 13 (Trixie)]

[mkvtoolnix]Affected
Details (3)
- 92.0-1 · amd64 · trixie
  Affected · Fixed: 92.0-1+deb13u1
  nvd · mkvtoolnix · debian · 13
- 92.0-1 · arm64 · trixie
  Affected · Fixed: 92.0-1+deb13u1
  nvd · mkvtoolnix · debian · 13
- 92.0-1+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 92.0-1+deb13u1
  nvd · mkvtoolnix · debian · 13
[mkvtoolnix-gui]Affected
Source package: [mkvtoolnix]
Details (3)
- 92.0-1 · amd64 · trixie
  Affected · Fixed: 92.0-1+deb13u1
  nvd · mkvtoolnix · debian · 13
- 92.0-1 · arm64 · trixie
  Affected · Fixed: 92.0-1+deb13u1
  nvd · mkvtoolnix · debian · 13
- 92.0-1+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 92.0-1+deb13u1
  nvd · mkvtoolnix · debian · 13

[openSUSE Tumbleweed]

[mkvtoolnix]Affected
Source package: [mkvtoolnix]
Details (1)
- 101.0-1.1 · x86_64 · tumbleweed
  Affected · Fixed: 101.0-2.1
  nvd · mkvtoolnix · opensuse · tumbleweed
[mkvtoolnix-gui]Unknown
Source package: [mkvtoolnix]
Details (1)
- 101.0-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 101.0-2.1
  Version impact unknown
  nvd · mkvtoolnix · opensuse · tumbleweed
[mkvtoolnix-tools]Unknown
Source package: [mkvtoolnix]
Details (1)
- 101.0-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 101.0-2.1
  Version impact unknown
  nvd · mkvtoolnix · opensuse · tumbleweed

Observed: Oct 27, 2026, 6:29:19 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]