Uncaught Exception Affecting undici package, versions >=7.0.0 <7.29.1>=8.0.0 <8.10.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-UNDICI-19635222
- published6 Sept 2026
- disclosed4 Sept 2026
- credithaoxiang Yan
Introduced: 4 Sep 2026
NewCVE-2026-85014 (opens in a new tab)How to fix?
Upgrade undici to version 7.29.1, 8.10.2 or higher.
Overview
undici is an An HTTP/1.1 client, written from scratch for Node.js
Affected versions of this package are vulnerable to Uncaught Exception in the WebSocketStream API, whose socket-close handler calls abort() on the writable stream while the application holds a writer lock and then discards the rejected promise that aborting a locked stream returns. An attacker can crash the process through Node's default unhandledRejection handling by tearing down a WebSocket connection without completing the close handshake, for example with a TCP reset, a proxy teardown, or a protocol-violating frame. This requires the application to use the WebSocketStream API while actively writing through a writer, and the server to be attacker-controlled or compromised.