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CVE-2026-54466 — Vulnerability in websocket-driver — CVE Details

CRITICAL

websocket-driver: Message corruption via abuse of protocol length headers

Published July 15, 2026Updated September 10, 2026Source: osv

Summary

### Impact The frame format in draft versions of the WebSocket protocol includes a length header that allows 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, a client can make the server parse these bytes into an ever-growing integer. Since JavaScript numbers are 64-bit floating point values, this number will eventually lose precision and lead to the subsequent payload being parsed incorrectly. ### Patches The issue has been patched in version 0.7.5 by rejecting the message if the length header exceeds the configured maximum message length. 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.

Advisory Timeline

  • First published July 15, 2026 (89 days ago).
  • Last revised September 10, 2026 — 56 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update websocket-driver to 0.7.5 or later
npm install websocket-driver@0.7.5

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
websocket-driver
npm
All versions0.7.5

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.6 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

References

Frequently Asked Questions

What is CVE-2026-54466?
websocket-driver: Message corruption via abuse of protocol length headers This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 8.6/10).
How do I check if my project is affected by CVE-2026-54466?
CVE-2026-54466 affects websocket-driver. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54466 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.6

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-xv26-6w52-cph6

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