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Brotli Vulnerability in Ubuntu Allows Remote Code Execution

Brotli Vulnerability in Ubuntu Allows Remote Code Execution

First seen 27 Oct 2026, 03:13 UTC • •
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ThreatCluster AI
ThreatCluster •October 27, 2026 at 06:43 UTC
  • •Brotli vulnerability allows remote code execution and DoS attacks.
  • •Affected Ubuntu versions include 26.10, 26.04 LTS, 24.04 LTS, and 22.04 LTS.
  • •Users should update to the latest package versions to mitigate risks.

A vulnerability in the Brotli compression utility allows remote attackers to execute arbitrary code or cause a denial of service by sending specially crafted compressed streams. This issue affects multiple versions of Brotli across various Ubuntu releases, including 26.10, 26.04 LTS, 24.04 LTS, and 22.04 LTS. The vulnerability was identified as a significant risk, prompting Ubuntu to release updates to mitigate the issue. Users are advised to update their systems to the latest package versions to address these vulnerabilities. The flaw does not appear to be in the wild at this time, but the potential for exploitation exists if systems are not updated. A standard system update will apply the necessary changes to secure affected installations.

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Timeline

2026-10-26
Ubuntu releases security notice USN-8956-1
Ubuntu disclosed a vulnerability in Brotli that could lead to remote code execution and denial of service. Users are urged to update their systems.
Ubuntu
2026-10-26
Linux Security reports on Brotli vulnerabilities
Linux Security published details on the Brotli vulnerabilities, emphasizing the need for updates to prevent potential exploitation.
Linuxsecurity

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Common questions

Which Ubuntu versions are affected?
The affected versions include Ubuntu 26.10, 26.04 LTS, 24.04 LTS, and 22.04 LTS.
How can I mitigate this vulnerability?
Update your system to the latest Brotli package versions as specified in the security notice.
Is there any active exploitation of this vulnerability?
Currently, there are no reports of active exploitation in the wild, but the vulnerability poses a risk if not patched.