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Vulnerabilities CVE-2026-54464

CVE-2026-54464

Medium
Open
TLP:CLEAR

websocket-driver: Resource limit bypass via message compression

NVD CVE.org
Critical Infrastructure

AI Analysis

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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.

Details

CVSS Score
6.3
EPSS Score
0.32%

25.1th percentile

CVSS Vector
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
Confidence
90%
Published
Jul 17, 2026
Last Modified
Jul 17, 2026
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