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CVE-2026-54463 — Vulnerability in websocket-driver — CVE Details

MEDIUM

websocket-driver: Memory exhaustion 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 server or client can make the other peer parse these bytes into an ever-growing integer. Since Ruby integers are arbitrary precision, this can be used to make a WebSocket connection consume an unbounded amount of memory and lead to the host process running out of memory. ### Patches The issue has been patched in version 0.8.1. 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) 5.8 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:N/VA:L/SC:N/SI:N/SA:L

References

Frequently Asked Questions

What is CVE-2026-54463?
websocket-driver: Memory exhaustion via abuse of protocol length headers This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.8/10).
How do I check if my project is affected by CVE-2026-54463?
CVE-2026-54463 affects websocket-driver. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54463 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.8

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

Also Known As

GHSA-ghhp-3qvg-889p

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