GHSA-33ph-fccm-39pj

Suggest an improvement
Source
https://github.com/advisories/GHSA-33ph-fccm-39pj
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-33ph-fccm-39pj/GHSA-33ph-fccm-39pj.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-33ph-fccm-39pj
Aliases
Downstream
CGA (52)
MINI (2)
Published
2026-07-15T22:03:59Z
Modified
2026-09-10T03:50:51Z
Severity
  • 6.3 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
websocket-driver: Resource limit bypass via message compression
Details

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.

Database specific 
{
    "cwe_ids":  [
        "CWE-770"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-07-15T22:03:59Z",
    "nvd_published_at":  "2026-07-17T20:17:26Z",
    "severity":  "MODERATE"
}
References

Affected packages

RubyGems / websocket-driver

Package

Name
websocket-driver
Purl
pkg:gem/websocket-driver

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.8.1

Affected versions

0.*
0.1.0
0.2.0
0.2.1
0.2.2
0.2.3
0.3.0
0.3.1
0.3.2
0.3.3
0.3.4
0.3.5
0.4.0
0.5.0
0.5.1
0.5.2
0.5.3
0.5.4
0.6.0
0.6.1
0.6.2
0.6.3
0.6.4
0.6.5
0.7.0
0.7.1
0.7.2
0.7.3
0.7.4
0.7.5
0.7.6
0.7.7
0.8.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-33ph-fccm-39pj/GHSA-33ph-fccm-39pj.json"