Regular Expression Denial of Service in websocket-extensions (NPM package)
Impact
The ReDoS flaw allows an attacker to exhaust the server's capacity to process incoming requests by sending a WebSocket handshake request containing a header of the following form:
Sec-WebSocket-Extensions: a; b="\c\c\c\c\c\c\c\c\c\c ...That is, a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. The parser takes exponential time to reject this header as invalid, and this will block the processing of any other work on the same thread. Thus if you are running a single-threaded server, such a request can render your service completely unavailable.
Patches
Users should upgrade to version 0.1.4.
Workarounds
There are no known work-arounds other than disabling any public-facing WebSocket functionality you are operating.
References
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | websocket-extensions | < 0.1.4 | 0.1.4 |
References
- https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv
- https://nvd.nist.gov/vuln/detail/CVE-2020-7662
- https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
- https://github.com/faye/websocket-extensions-node
- https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H- Weakness (CWE)
CWE-400- Platform
- npm
- Package
websocket-extensions- Disclosed
- 05.06.2020
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-g78m-2chm-r7qv - CC BY 4.0
Vulnerability history: websocket-extensions
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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