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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
2026-08-06
Advisory published
2026-07-17
Advisory updated
2026-08-06

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54466 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54466

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-54466 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54466

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.