CVE-2026-90783 Details
Description
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.
A heap buffer overflow vulnerability has been identified in MKVToolNix versions through 101.0. This issue arises in the bundled avilib library's ODML superindex parser, where integer wraparound in 32-bit arithmetic leads to improper memory allocation. Attackers can exploit this vulnerability by crafting a malicious AVI file with oversized entry counts, causing an undersized heap allocation. When the file is parsed with mkvmerge, the inadequate allocation is exploited, resulting in a heap buffer overflow.
Users can update to MKVToolNix version 102.0 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 13, 2026CISA-ADP
Assessed Sep 14, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-680 | Integer Overflow to Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| MKVToolNix | <= 101.0 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | CVE Modified | CISA-ADP |
| Sep 13, 2026 | New CVE Received | [email protected] |