EUVD-2026-71465Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AC:H reflects the experimental WebSocketStream prerequisite; A:H reflects unconditional process termination; C and I are N with no data exposure or integrity impact.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
Lifecycle Timeline
3DescriptionCVE.org
undici's experimental WebSocketStream client crashes the whole Node.js process when a remote peer closes the TCP connection without a WebSocket close handshake. On an unclean close the internal socket-close handler calls abort on the writable stream unconditionally and discards the returned promise, but per the WHATWG Streams standard aborting a locked writable returns a promise that rejects with a TypeError. Because the application holds a writer on that writable, which is the only way to write, the rejection is never observed and Node's default unhandled-rejection behavior terminates the process. An untrusted server can therefore crash a client with a single abrupt disconnect, with no authentication and no application mistake. This affects undici versions from 7.0.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.
AnalysisAI
Process-terminating denial of service in undici's experimental WebSocketStream client allows any server-or network man-in-the-middle-to crash a Node.js application by abruptly closing the TCP connection without performing a WebSocket close handshake. The flaw exists in undici 7.0.0-7.29.0 and 8.0.0-8.10.1, where the socket-close handler calls abort() on a locked WHATWG WritableStream and discards the resulting rejected Promise, triggering Node.js's default unhandled-rejection process-termination behavior. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three conditions: (1) the target application explicitly imports and uses undici's experimental WebSocketStream class-not the stable WebSocket class, fetch, or any other undici API; (2) the application holds a WritableStreamDefaultWriter on the stream's writable property, which is the standard way to write data and therefore normal usage; and (3) the attacker can control the WebSocket server the client connects to, or is positioned as a network man-in-the-middle capable of injecting a TCP reset on the connection. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.9 (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately reflects a medium-priority denial-of-service risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: undici 7.29.1 (7.x branch) and undici 8.10.2 (8.x branch), as confirmed by the OpenJS Foundation security advisory GHSA-rx4f-c7p8-82vq at https://github.com/nodejs/undici/security/advisories/GHSA-rx4f-c7p8-82vq. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-248 – Uncaught Exception
View allSame technique Denial Of Service
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External POC / Exploit Code
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