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Critical Buffer Overflow in libEBML Affects Ubuntu Systems

Critical Buffer Overflow in libEBML Affects Ubuntu Systems

First seen 11 Sep 2026, 04:46 UTC • •
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ThreatCluster AI
ThreatCluster •September 11, 2026 at 11:48 UTC
  • •libEBML vulnerability can cause denial of service on Ubuntu systems.
  • •Affected versions include Ubuntu 22.04, 20.04, 18.04, and 16.04 LTS.
  • •Users are advised to update their systems to mitigate risks.

A critical vulnerability has been identified in the libEBML library, which incorrectly handles read and write operations. This flaw can lead to a buffer overflow, potentially causing a denial of service. Affected systems include Ubuntu 22.04 LTS, 20.04 LTS, 18.04 LTS, and 16.04 LTS, with specific package versions listed for updates. The vulnerability was discovered recently, and users are advised to apply standard system updates to mitigate the risk. Ubuntu Pro users have access to extended security maintenance for these packages. No specific CVE identifier was provided in the articles. The issue is considered serious but has not been reported as actively exploited in the wild.

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Timeline

2026-09-10
Vulnerability discovered in libEBML
The flaw was found to incorrectly handle read and write operations, leading to potential buffer overflow.
Linuxsecurity
2026-09-10
Ubuntu Security Notice USN-8746-1 released
Ubuntu issued a notice detailing the vulnerability and recommended updates for affected systems.
Ubuntu
Recent
Users advised to apply updates
Users are encouraged to perform standard system updates to address the vulnerability.
Linuxsecurity

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