{"id":"EM-20261111-SYMG","url":"https://cyber.eventmonitor.net/incident/EM-20261111-SYMG/node-js-http-2-vulnerability-cve-2026-123863/","type":"cve","title":"Node.js HTTP/2 Vulnerability (CVE-2026-123863)","subtitle":"CVE-2026-123863","subject":"CVE-2026-123863","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-11T19:17:32.577Z","firstSignal":"2026-11-11T18:16:12.000Z","lastSignal":"2026-11-11T19:17:32.577Z","updated":"2026-11-12T00:31:06.720Z","revision":1,"life":[{"status":"Born","at":"2026-11-11T19:17:32.577Z","why":"second independent source: C6 NVD CVE API 2.0"},{"status":"Developing","at":"2026-11-11T19:17:32.577Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-11T18:16:12.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-11-11T19:17:32.577Z","what":"Born: second source, C6 NVD CVE API 2.0. Page EM-20261111-SYMG created."}],"stages":[{"name":"Disclosed","at":"2026-11-11T19:17:32.577Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-11T19:17:32.577Z","detail":"CVSS 8.2"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-11-11T18:16:12.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-11T18:16:12.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":3,"title":"Red Hat: CVE-2026-123863 (important)","text":"nodejs: Node.js: Denial of Service via improper HTTP/2 session teardown","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-123863.json"},{"at":"2026-11-11T19:17:32.577Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-123863 (CVSS 8.2)","text":"A reachable assertion in Node.js HTTP/2 session teardown lets any unauthenticated client abort the server, over both TLS and cleartext. A client can arrange for an Http2Stream that still holds nghttp2-allocated header buffers to outlive its session: the stream is removed from the session's stream set but never detached, so when ~Http2Session() runs the memory accounting is nonzero and the CHECK_EQ(current_nghttp2_memory_, 0) assertion fails, terminating the process. The trigger needs only a default http2 server whose handler responds before the request body has ended, which is typical. It is…","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123863"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-11T19:17:32.577","score":8.2,"severity":"HIGH","desc":"A reachable assertion in Node.js HTTP/2 session teardown lets any unauthenticated client abort the server, over both TLS and cleartext. A client can arrange for an Http2Stream that still holds nghttp2-allocated header buffers to outlive its session: the stream is removed from the session's stream…","product":"","seen":1794435185345},"kev":null,"epss":null,"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}