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CVE-2026-90783

MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparound

8.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.20%Up 0.1 points since Sep 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.5

MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparound

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.

Record
CVE-2026-90783
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-680
Updated
2026-11-02
EUVDEUVD-2026-77010 8.5

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.

Record
EUVD-2026-77010
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-x9xf-h66v-mjmc 8.5

MKVToolNix through 101.0 contains a heap buffer overflow in the bundled avilib library's ODML...

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.

Record
GHSA-x9xf-h66v-mjmc
CVSS 4.0
8.5 HighCVSS: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
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-680
Updated
2026-11-02
NVD 8.5

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.

Record
CVE-2026-90783
CVSS 4.0
8.5 HighCVSS: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
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-680
Updated
2026-11-02
OSVALPINE-CVE-2026-90783 8.5

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.

Record
ALPINE-CVE-2026-90783
CVSS 4.0
8.5 HighCVSS: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
Updated
2026-11-03
OSVDEBIAN-CVE-2026-90783 8.5

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.

Record
DEBIAN-CVE-2026-90783
CVSS 4.0
8.5 HighCVSS: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
Updated
2026-11-02
OSVUBUNTU-CVE-2026-90783 8.5

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.

Record
UBUNTU-CVE-2026-90783
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2026:11779-1 No score

mkvtoolnix-101.0-2.1 on GA media

These are all security issues fixed in the mkvtoolnix-101.0-2.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11779-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21867-1 No score

Security update for mkvtoolnix

This update for mkvtoolnix fixes the following issues:

Changes in mkvtoolnix:

  • CVE-2026-90783: heap buffer overflow in the bundled avilib library's ODML superindex parser due to integer wraparound in 32-bit arithmetic (boo#1280126).
Record
openSUSE-SU-2026:21867-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mkvtoolnix
Alpine:v3.24
 before 99.0-r1
99.0-r1
mkvtoolnix
Debian:12
 before 74.0.0-1+deb12u1, plus listed versions
74.0.0-1
74.0.0-1+deb12u1
mkvtoolnix
Debian:13
 before 92.0-1+deb13u1, plus listed versions
92.0-1
92.0-1+deb13u1
mkvtoolnix
Debian:14
 before 101.0-2, plus listed versions
100.0-1100.0-2101.0-192.0-194.0-1
Show 5 moreShow less
95.0-196.0-197.0-198.0-199.0-1
101.0-2
mkvtoolnix
Ubuntu:16.04:LTS
 All versions, plus listed versions
8.2.0-28.5.1-18.5.2-18.6.0-18.6.1-18.7.0-18.8.0-1
 None known
mkvtoolnix
Ubuntu:18.04:LTS
 All versions, plus listed versions
15.0.0-115.0.0-1build117.0.0-218.0.0-119.0.0-1
 None known
mkvtoolnix
Ubuntu:20.04:LTS
 All versions, plus listed versions
37.0.0-1build138.0.0-139.0.0-140.0.0-140.0.0-3
Show 8 moreShow less
41.0.0-142.0.0-143.0.0-143.0.0-1ubuntu143.0.0-1ubuntu244.0.0-1ubuntu145.0.0-1ubuntu145.0.0-2
 None known
mkvtoolnix
Ubuntu:22.04:LTS
 All versions, plus listed versions
60.0.0-262.0.0-1build163.0.0-164.0.0-165.0.0-1
 None known
mkvtoolnix
Ubuntu:24.04:LTS
 All versions, plus listed versions
78.0-279.0-180.0-181.0-181.0-1build182.0-182.0-1build182.0-1build2
 None known
mkvtoolnix
Ubuntu:26.10
 All versions, plus listed versions
97.0-1build198.0-199.0-1100.0-2
 None known
mkvtoolnix
Ubuntu:26.04:LTS
 All versions, plus listed versions
94.0-195.0-196.0-197.0-197.0-1build1
 None known
mkvtoolnix
openSUSE:Tumbleweed
 before 101.0-2.1
101.0-2.1
mkvtoolnix
openSUSE:Leap 16.0
 before 95.0-bp160.2.1
95.0-bp160.2.1

History

History
RecordedChangedSources
affected, aliases, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-90783 is a high vulnerability (CVSS 8.5) in Moritz Bunkus Mkvtoolnix, published September 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 10th percentile. Fixed in mkvtoolnix 99.0-r1.

References

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