# CVE-2026-54464: ruby-websocket-driver: ### Impact  If this library is used in tandem with the `permessage-deflate` extension, a WebSocket server or client c...

CVE-2026-54464 is fixed in ruby-websocket-driver on 1 platform by DEBIAN-CVE-2026-54464 (version 0.8.1-1), released July 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-54464
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0045
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 17, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ruby-websocket-driver Debian 14 | 0.8.1-1 | [DEBIAN-CVE-2026-54464](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54464.md) | Jul 19, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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