PatchSiren cyber security CVE debrief
CVE-2026-54466 faye CVE debrief
CVE-2026-54466 is a critical vulnerability in websocket-driver, a WebSocket protocol handler with pluggable I/O. The issue allows an attacker to cause an infinite loop by sending a specially-crafted sequence of bytes, potentially leading to incorrect parsing of subsequent payloads. This vulnerability is fixed in version 0.7.5. Affected product deployments should be reviewed for exposure and updated to the fixed version.
- Vendor
- faye
- Product
- websocket-driver-node
- CVSS
- CRITICAL 9.2
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-17
- Original CVE updated
- 2026-07-17
- Advisory published
- 2026-07-17
- Advisory updated
- 2026-07-17
Who should care
Users of websocket-driver, especially those using versions prior to 0.7.5, should be aware of this vulnerability and take immediate action to update their dependencies. Operators, platform administrators, vulnerability management teams, and security teams may be impacted by this vulnerability.
Technical summary
The vulnerability exists in the frame format handling of draft versions of the WebSocket protocol in websocket-driver. Specifically, the length header allows for an arbitrarily large integer to be encoded as a sequence of bytes with the high bit set. By sending an indefinite sequence of bytes with values 0x80 or above, an attacker can cause the server to parse these bytes into an ever-growing integer, eventually losing precision due to JavaScript's 64-bit floating-point representation. This leads to incorrect parsing of subsequent payloads.
Defensive priority
High
Recommended defensive actions
- Update websocket-driver to version 0.7.5 or later
- Review and update affected applications and services
- Monitor for potential exploitation attempts
- Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
- Review compensating controls for exposed systems while remediation is scheduled and verified
- Check relevant monitoring, detection, and logs for exposed assets that need extra review
- Track exceptions, retest remediated assets, and close the item only after evidence is documented
Evidence notes
The CVE record was published on 2026-07-17T21:17:08.657Z and has not been modified since then. The NVD entry is currently 9.2 CRITICAL. Evidence is limited to CVE and NVD details. Defenders should verify affected scope and vendor guidance with official sources.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-17T21:17:08.657Z and has not been modified since then.