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 …
Exact source revision recorded 30 Oct 2026 01:55:44 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-101959
Publishedundici 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.
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
Original publisher date fields
datePublished: Oct 15, 2026, 8:12:51 AM
dateUpdated: Oct 15, 2026, 2:22:28 PM
2 related source bulletins · separate from aliases
RHSA-2026:76677: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
CVE-2024-24786 · CVE-2026-56851 · CVE-2026-61801 · CVE-2026-95502 · CVE-2026-97394 · CVE-2026-100347 · CVE-2026-100348 · CVE-2026-100349 · CVE-2026-100350 · CVE-2026-100351 · CVE-2026-101899 · CVE-2026-109855
RHSA-2026:83198: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
CVE-2026-109855
- Source published
- Oct 15, 2026, 8:12:51 AM (timezone not stated)
- Source modified
- Oct 15, 2026, 2:22:28 PM (timezone not stated)
- Observed here
- 30 Oct 2026 01:55:44 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.
EUVD CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H