{"id":"CVE-2026-78663","revision":"6ee6707ce8f047529998d0e31e9657ee","records":[{"revision":"6ee6707ce8f047529998d0e31e9657ee","observedAt":"2026-10-25T16:19:04.694+00:00","statement":{"source":"nvd","id":"CVE-2026-78663","aliases":[],"title":"The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered data.…","description":"The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered data. A malicious client can exploit this to bypass the configured connection-level flow control limit (MaxReceiveBufferPerConnection). Total buffered data is still limited by the concurrent stream limit and stream-level flow control.","state":0,"publishedAt":"2026-10-08T23:17:03.647+00:00","modifiedAt":"2026-10-09T17:16:49.42+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · 134c704f-9b21-4f2e-91b3-4a467353bcc0 · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","score":9.1,"severity":"CRITICAL"}],"references":["https://go.dev/cl/847187","https://go.dev/cl/847310","https://go.dev/issue/81743","https://groups.google.com/g/golang-announce/c/U2fTuyDJznI","https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs","https://pkg.go.dev/vuln/GO-2026-6612"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78663","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-675"],"productCriteria":[],"sourceDates":{"published":"2026-10-08T23:17:03.647","lastModified":"2026-10-09T17:16:49.420"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-78663","identifiers":["CVE-2026-78663"]},"retained":false,"historicalAffected":[]}],"coverage":[]}