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A GitHub-reviewed security advisory, not necessarily under active exploitation the way our CISA KEV advisories are, but a real, disclosed vulnerability in an open-source dependency.
Affected packages
Vulnerable: >= 7.0.0, < 7.29.1
Patched in 7.29.1
Vulnerable: >= 8.0.0, < 8.10.2
Patched in 8.10.2
Details
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.
Upgrade to undici v7.29.1 or v8.10.2.
No workaround is available.
EPSS, exploit probability
Low0.37%
estimated chance of real-world exploitation in the next 30 days, higher than 31.1% of every CVE FIRST.org scores
Refreshed 11/14/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.
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