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Thu, 15 Oct 2026 15:30:00 +0000
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ssvc
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Thu, 15 Oct 2026 13:30:00 +0000
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| Description | undici is an HTTP client library for Node.js. In versions 8.11.0 and 8.11.1, its experimental WebSocket client, which is enabled by default when HTTP/2 is allowed, mishandles a failed WebSocket handshake over HTTP/2: the request is already marked completed, so the abort becomes a no-op and the underlying HTTP/2 stream is left open with no error listener. When a malicious server then destroys the connection, the orphaned stream emits an unhandled error and the Node.js process exits. A remote, unauthenticated server can therefore crash any client that opens a WebSocket to it over HTTP/2, resulting in a denial of service. The issue is fixed in undici 8.11.2, and users should upgrade to 8.11.2 or later. As a workaround, set allowH2 to false to disable HTTP/2 for WebSocket connections, or avoid opening WebSocket connections to untrusted servers. | |
| Title | undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake | |
| Weaknesses | CWE-248 CWE-754 |
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threat_severity
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cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: openjs
Published:
Updated: 2026-10-15T14:22:28.644Z
Reserved: 2026-10-13T07:28:59.621Z
Link: CVE-2026-109855
Updated: 2026-10-15T14:22:23.478Z
Status : Awaiting Analysis
Published: 2026-10-15T09:17:16.573
Modified: 2026-10-15T20:38:04.303
Link: CVE-2026-109855
OpenCVE Enrichment
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