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Remote Code Execution Vulnerability Discovered in Brotli Compression Library

Remote Code Execution Vulnerability Discovered in Brotli Compression Library

First seen 24 Oct 2026, 04:43 UTC • •
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ThreatCluster AI
ThreatCluster •October 24, 2026 at 06:13 UTC
  • •A remote code execution vulnerability in Brotli affects many software applications.
  • •The flaw allows unauthenticated attackers to execute code via malicious compressed data.
  • •Patches are being released, and affected users must update their software immediately.

OpenAI disclosed a vulnerability in the Brotli compression library that allows unauthenticated remote code execution. The flaw enables attackers to execute arbitrary code on affected systems by sending malicious compressed data. This vulnerability affects widely-used software, including Node.js, Bun, and Envoy. Although the root cause was fixed in February 2026, the security implications were not recognized until now, leading to a delay in the release of patches. OpenAI has notified Brotli and downstream projects, which are now releasing security updates. Affected users are urged to apply these updates promptly to mitigate the risk. The vulnerability has been assigned a CVE, and further details on the patch can be found at patchtheplanet.org/brotli.

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Timeline

2026-02-01
Root cause fixed in Brotli
The underlying issue in Brotli was resolved, but security implications were not recognized at the time.
OpenAI
2026-10-23
Vulnerability disclosed by OpenAI
OpenAI announced the discovery of a remote code execution vulnerability during a red-teaming exercise.
OpenAI
2026-10-24
Security updates released
Node.js and other downstream projects are releasing updates to address the vulnerability.
Greg Brockman

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Common questions

Which software is affected by this vulnerability?
The vulnerability affects software that uses the Brotli compression library, including Node.js, Bun, and Envoy.
When was the vulnerability discovered?
The vulnerability was disclosed on October 23, 2026, during a red-teaming exercise by OpenAI.
What should users do to protect their systems?
Users should apply the latest security updates released by their software vendors to mitigate the risk.