Vulnerability · Published Jul 17, 2026 · Assigned by GitHub_M
CVE-2026-54464websocket-driver: Resource limit bypass via message compression
Medium 6.3
In plain English
A medium-severity resource allocation without limits in websocket-driver-ruby from faye. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ruby-websocket-driver | no fix listed | DEBIAN-CVE-2026-54464 |
| Debian:13 | ruby-websocket-driver | no fix listed | DEBIAN-CVE-2026-54464 |
| Debian:14 | ruby-websocket-driver | 0.8.1-1 | DEBIAN-CVE-2026-54464 |
| RubyGems | websocket-driver | 0.8.1 | GHSA-33ph-fccm-39pj |
| Ubuntu:22.04:LTS | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54464 |
| Ubuntu:24.04:LTS | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54464 |
| Ubuntu:26.04:LTS | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54464 |
| Ubuntu:26.10 | ruby-websocket-driver | no fix listed | UBUNTU-CVE-2026-54464 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| faye | websocket-driver-ruby | < 0.8.1 |
Weakness: CWE-770 · 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