CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2020-7662
High (7.5) in websocket-extensions project websocket-extensions. EPSS 3.1% chance of exploitation in the next 30 days. Fixed in websocket-extensions 0.1.4.
websocket-extensions npm module prior to 0.1.4 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.
Severity
- EPSS
- 3.1% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-31)
- Published
- Modified
- Record from
- the NVD, synced
Affected
- websocket-extensions_project:websocket-extensions
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-g78m-2chm-r7qv | npm | websocket-extensions | <0.1.4 | 0.1.4 |
References
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
- https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237
- https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv
- https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623
- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions