Vulnerability Description
### Impact If this library is used in tandem with the `permessage-deflate` extension, a WebSocket server or client can be made to accept messages that are larger than the configured maximum message size. This is because this limit is checked against the message frames' length headers, which give the size of the compressed data, not the size after decompression. This can lead to applications accepting larger messages than expected and exceeding their intended resource usage. ### Patches The issue has been patched in version 0.8.1, by checking the length of messages after they are processed by incoming extensions. All users should upgrade to this version. ### Workarounds No known workarounds exist. ### Acknowledgements This issue was discovered and reported by Pranjali Thakur, DepthFirst Security Research Team.
Related Weaknesses (CWE)
References
- https://github.com/faye/websocket-driver-ruby/commit/fa8641724f10bf3273585f1dcf9
- https://github.com/faye/websocket-driver-ruby/security/advisories/GHSA-33ph-fccm
FAQ
What is CVE-2026-54464?
CVE-2026-54464 is a documented vulnerability. ### Impact If this library is used in tandem with the `permessage-deflate` extension, a WebSocket server or client can be made to accept messages that are larger than the configured maximum message s...
How severe is CVE-2026-54464?
CVSS scoring is not yet available for CVE-2026-54464. Check NVD for updates.
Is there a patch for CVE-2026-54464?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.