GHSA-rx4f-c7p8-82vq
undici vulnerable to Denial of Service via WebSocketStream unclean close
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
## Impact
undici's `WebSocketStream` crashes the client process when a WebSocket connection is closed abruptly without a close handshake. On such an unclean close, the internal socket-close handler calls `abort()` on the writable stream even when the application holds a writer lock. Per the WHATWG Streams standard, aborting a locked stream returns a promise that rejects with a `TypeError`, and the handler discards that promise. The unobserved rejection surfaces as an `unhandledRejection` and, under Node.js's default behavior, terminates the process.
A malicious or compromised WebSocket server can crash a client with a single connection teardown (a TCP reset, a proxy teardown, or a protocol-violating frame). Affected applications are those using the `WebSocketStream` API and writing through a writer, which is the standard way to write.
All releases from undici 7.0.0 are affected. WebSocketStream was introduced in 7.0.0.
## Patches
Upgrade to undici v7.29.1 or v8.10.2.
## Workarounds
No workaround is available.
References
External links from the advisory. They lead to third-party sites.
- https://github.com/nodejs/undici/security/advisories/GHSA-rx4f-c7p8-82vq
- https://nvd.nist.gov/vuln/detail/CVE-2026-85014
- https://github.com/nodejs/undici/commit/1858656ebb1e919311c1f31613dfd581b7214349
- https://github.com/nodejs/undici/commit/662d0ea671fe64139e79533c913fce412765e1d7
- https://cna.openjsf.org/security-advisories.html
- https://github.com/nodejs/undici
- https://github.com/nodejs/undici/releases/tag/v7.29.1
- https://github.com/nodejs/undici/releases/tag/v8.10.2