GitHub Advisoryadvisory · RubyGems
GHSA-8j3g-f24p-4mpw websocket-driver: Memory exhaustion in HTTP header parser
MEDIUM
Official page ↗
- Aliases
- CVE-2026-54465
- Ecosystem
- RubyGems
- Packages
- websocket-driver
- Severity
- Moderate
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
- Weaknesses
- CWE-400, CWE-770
- Reviewed
- 2026-07-15
Affected packages
• RubyGems websocket-driver: < 0.8.1 → fixed in 0.8.1
Description
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.
Related
Alias · CVE (1)
- CVE-2026-54465 websocket-driver is a WebSocket protocol handler with pluggable I/O. vulnerability
References
- https://github.com/faye/websocket-driver-ruby/security/advisories/GHSA-8j3g-f24p-4mpw web
- https://nvd.nist.gov/vuln/detail/CVE-2026-54465 advisory
- https://github.com/faye/websocket-driver-ruby/commit/17b569f232896e71d458404ccf4854f80e987710 web
- https://github.com/faye/websocket-driver-ruby package
- https://github.com/faye/websocket-driver-ruby/releases/tag/0.8.1 web
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/websocket-driver/CVE-2026-54465.yml web
- https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54465 web