websocket-driver: Resource limit bypass via message compression
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.
Summary
### 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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| faye | websocket-driver-ruby | before 0.8.1 | 0.8.1 | Patch available | CNA |
| — | websocket-driver (RubyGems) | before 0.8.1 | 0.8.1 | Patch available | GHSA-33ph-fccm-39pj |
- websocket-driver-ruby Vendorfaye Affected before 0.8.1 Fixed in 0.8.1 Patch available CNA
- websocket-driver (RubyGems) Vendor— Affected before 0.8.1 Fixed in 0.8.1 Patch available GHSA-33ph-fccm-39pj
Remediation
- Fix · CNA websocket-driver-ruby (faye) Fixed in 0.8.1
- Fix · GHSA-33ph-fccm-39pj websocket-driver (RubyGems) Fixed in 0.8.1 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat 3scale API Management Platform 2 | Affected | No fix planned: Will not fix |
Not affected: 3 products
- Red Hat 3scale API Management Platform 2
- Red Hat Hardened Images
- Red Hat Satellite 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-54464
- 2026-10-03 Alias added: GHSA-33ph-fccm-39pj
References
Other 6
- https://github.com/faye/websocket-driver-ruby/security/advisories/GHSA-33ph-fccm-39pj
- https://github.com/faye/websocket-driver-ruby/commit/fa8641724f10bf3273585f1dcf9041f540bbd036
- https://github.com/faye/websocket-driver-ruby
- 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-2026-54464.yml
- https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54464
More faye vulnerabilities
- TI-2026-39323 websocket-driver: Message corruption via abuse of protocol length headers CVSS 4.0CRITICAL 9.2
- TI-2020-08894 Authentication and extension bypass in Faye CVSS 3.1CRITICAL 9.8
- TI-2026-44153 websocket-driver: Denial of service via malformed Host header CVSS 4.0HIGH 8.9
- TI-2020-11907 Missing TLS certificate verification in Faye CVSS 3.1HIGH 8.7
- TI-2020-11906 Missing TLS certificate verification in Faye Websocket CVSS 3.1HIGH 8.7
- TI-2026-39320 websocket-driver: Memory exhaustion via abuse of protocol length headers CVSS 4.0MEDIUM 6.9
Sources
- CVE-2026-54464 · CVE Program
- CVE-2026-54464 · NVD
- FIRST EPSS
- GHSA-33ph-fccm-39pj · GitHub Advisory Database · CC BY 4.0
- CVE-2026-54464 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences