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CVE-2026-54464 — Vulnerability in websocket-driver — CVE Details

MEDIUM

websocket-driver: Resource limit bypass via message compression

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

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.

Advisory Timeline

  • First published July 15, 2026 (88 days ago).
  • Last revised September 10, 2026 — 56 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update websocket-driver to 0.8.1 or later
gem install websocket-driver -v 0.8.1

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

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
websocket-driver
rubygems
0.1.0, 0.2.0, 0.2.1, 0.2.2 (+28 more)0.8.1

Vulnerability Classification

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

  • CWE-770
    Allocation of Resources Without LimitsMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.3 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:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

References

Frequently Asked Questions

What is CVE-2026-54464?
websocket-driver: Resource limit bypass via message compression This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.3/10).
How do I check if my project is affected by CVE-2026-54464?
CVE-2026-54464 affects websocket-driver. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54464 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.3

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-33ph-fccm-39pj

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