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Heap Overflow Vulnerability in Fedora's Mkvtoolnix and Dependencies

Heap Overflow Vulnerability in Fedora's Mkvtoolnix and Dependencies

First seen 13 Oct 2026, 15:31 UTC • •
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ThreatCluster AI
ThreatCluster •October 13, 2026 at 16:35 UTC
  • •CVE-2026-90783 is a critical heap overflow vulnerability in Mkvtoolnix.
  • •Affected systems include Fedora 44 and earlier versions, requiring immediate patching.
  • •No active exploitation has been confirmed, but the vulnerability poses significant risks.

A heap overflow vulnerability (CVE-2026-90783) has been identified in Mkvtoolnix, affecting Fedora 44 and earlier versions. This vulnerability allows attackers to execute arbitrary code by exploiting malformed AVI files. The flaw impacts Mkvtoolnix, libebml, and libmatroska libraries, which are essential for handling multimedia files. The vulnerability was disclosed on September 13, 2026, with a CVSS score of 7.8, indicating a high severity. Patches have been released for Fedora 44 and earlier versions, with updates available via the 'dnf' package manager. Users are urged to apply these updates promptly to mitigate risks. The updates include changes to required library versions and address the heap overflow issue. The vulnerability is currently not reported as being in the wild.

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Timeline

2026-09-13
CVE-2026-90783 published
A heap buffer overflow vulnerability in Mkvtoolnix was disclosed, allowing arbitrary code execution via malicious AVI files.
Linuxsecurity
2026-10-11
Patches released for Fedora 44
Updates were made available to address CVE-2026-90783, including required updates for libebml and libmatroska.
Linuxsecurity
2026-10-11
Backported fix for Fedora 43
A fix for CVE-2026-90783 was backported to Fedora 43, ensuring older systems are also protected.
Linuxsecurity

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Common questions

Which versions are affected?
Fedora 44 and earlier versions are affected by CVE-2026-90783.
Is this vulnerability being exploited?
Currently, there are no reports of active exploitation in the wild.
What should users do?
Users should apply the latest updates via the 'dnf' package manager to mitigate the vulnerability.