### 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.
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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| faye | websocket-driver-ruby | affected |
|
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Project Subscriptions
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Advisories
| Source | ID | Title |
|---|---|---|
 Github GHSA |
GHSA-33ph-fccm-39pj | websocket-driver: Resource limit bypass via message compression |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Fri, 17 Jul 2026 20:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | ### 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. | |
| Title | websocket-driver: Resource limit bypass via message compression | |
| Weaknesses | CWE-770 | |
| References |
| |
| Metrics |
cvssV4_0
|
Projects
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-17T20:03:36.326Z
Reserved: 2026-06-15T15:30:40.319Z
Link: CVE-2026-54464
Vulnrichment
No data.
NVD
No data.
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses