{"id":"EUVD-2026-101959","revision":"85bf1233e88e46cf8947eb9b05a05024","records":[{"revision":"85bf1233e88e46cf8947eb9b05a05024","observedAt":"2026-10-30T01:55:44.649+00:00","statement":{"source":"euvd","id":"EUVD-2026-101959","aliases":["CVE-2026-109855","GHSA-qq8j-7v2v-3rwp"],"title":"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 …","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://github.com/nodejs/undici/security/advisories/GHSA-qq8j-7v2v-3rwp","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-101959","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 15, 2026, 8:12:51 AM","dateUpdated":"Oct 15, 2026, 2:22:28 PM"},"relatedAdvisories":[{"id":"RHSA-2026:76677","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","vulnerabilityIds":["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"]},{"id":"RHSA-2026:83198","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","vulnerabilityIds":["CVE-2026-109855"]}],"note":"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."},"key":"euvd:EUVD-2026-101959","identifiers":["EUVD-2026-101959","CVE-2026-109855","GHSA-qq8j-7v2v-3rwp"]},"retained":false,"historicalAffected":[]}],"coverage":[]}