{"id":"GO-2026-6612","revision":"7acd0900ca584768926053dad46f20b3","records":[{"revision":"7acd0900ca584768926053dad46f20b3","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6612","aliases":["BIT-golang-2026-78663","CVE-2026-78663"],"title":"Double flow control refund on HTTP/2 server streams in net/http","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":"2026-10-08T22:31:09+00:00","modifiedAt":"2026-10-16T09:55:54.1290822+00:00","affected":[{"ecosystem":"Go","name":"stdlib","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.26.9"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"stdlib","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.27.0-0"},{"kind":"fixed","version":"1.27.2"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"golang.org/x/net","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.60.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"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"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6612","license":"OSV · upstream source license applies","key":"osv:GO-2026-6612","identifiers":["GO-2026-6612","BIT-golang-2026-78663","CVE-2026-78663"]},"retained":false,"historicalAffected":[]}],"coverage":[]}