CVE-2026-54465

Summary

websocket-driver: Memory exhaustion in HTTP header parser

Severity

medium

EPSS

0.5% (p42)

CWE

CWE-400

Also known as

GHSA-8j3g-f24p-4mpw

Published

2026-07-15

Updated

2026-07-15

Advisory details

Impact

If this library is used to implement a WebSocket server on top of a TCP server (rather than an HTTP server or framework) using the WebSocket::Driver.server() method, or, if it is used to complement a WebSocket client, then a peer can make a single connection consume an unbounded amount of memory by sending an HTTP request or response with a never-ending list of headers. This can lead to the receiving process running out of memory.

Patches

The issue has been patched in version 0.8.1, by limiting the total size of HTTP request/response lines and headers accepted by the parser to 32 kB. 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.

References

• https://github.com/advisories/GHSA-8j3g-f24p-4mpw
• https://github.com/faye/websocket-driver-ruby/security/advisories/GHSA-8j3g-f24p-4mpw
• https://github.com/faye/websocket-driver-ruby/releases/tag/0.8.1
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/websocket-driver/CVE-2026-54465.yml
• https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54465

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