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CVE-2026-54465 — websocket-driver: Memory exhaustion in...

MEDIUM

websocket-driver: Memory exhaustion in HTTP header parser

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

Summary

### Impact If this library is used to implement a WebSocket server on top of a TCP server (rather than an HTTP server or framework) using the `WebSocket::Driver.server()` method, or, if it is used to complement a WebSocket client, then a peer can make a single connection consume an unbounded amount of memory by sending an HTTP request or response with a never-ending list of headers. This can lead to the receiving process running out of memory. ### Patches The issue has been patched in version 0.8.1, by limiting the total size of HTTP request/response lines and headers accepted by the parser to 32 kB. 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-400
    Uncontrolled Resource ConsumptionMITRE
  • 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-2026-54465?
websocket-driver: Memory exhaustion in HTTP header parser 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-2026-54465?
CVE-2026-54465 affects websocket-driver. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54465 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-8j3g-f24p-4mpw

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