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Critical CVE-2026-90783: MKVToolNix Buffer Overflow Vulnerability

Critical CVE-2026-90783: MKVToolNix Buffer Overflow Vulnerability

First seen 14 Sep 2026, 10:47 UTC • •
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ThreatCluster AI
ThreatCluster •September 14, 2026 at 11:21 UTC
  • •CVE-2026-90783 affects MKVToolNix versions up to 101.0.
  • •Exploitation can lead to code execution via crafted AVI files.
  • •Immediate patching and monitoring for unusual application behavior are essential.

A heap buffer overflow vulnerability has been identified in MKVToolNix versions up to 101.0, stemming from an integer wraparound in the avilib library's ODML superindex parser. Attackers can exploit this flaw by crafting malicious AVI files, which may lead to application crashes and potential code execution with user privileges. The vulnerability affects analysts, content teams, and developers who handle untrusted video files. Exploitation does not require application privileges, but user interaction is necessary. Immediate remediation is advised, as the vulnerability has been published as CVE-2026-90783 on September 13, 2026. Monitoring for unusual application behavior and applying vendor patches are critical steps for affected organizations.

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Timeline

2026-09-13
CVE-2026-90783 published
A heap buffer overflow vulnerability in MKVToolNix was officially disclosed, affecting versions up to 101.0.
Redpacketsecurity
2026-09-14
Vulnerability alert issued
Security advisories were published urging immediate action to mitigate the risks associated with CVE-2026-90783.
www.vulncheck.com

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