{"id":"GO-2026-6090","summary":"Limit handshake messages we are willing to accept post-handshake in crypto/tls","details":"Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.","aliases":["BIT-golang-2026-56862","CVE-2026-56862"],"modified":"2026-09-09T10:41:40.069013321Z","published":"2026-08-13T21:43:54Z","related":["RHSA-2026:54835","RHSA-2026:54836","RHSA-2026:60304","RHSA-2026:60305","RHSA-2026:60306","RHSA-2026:61882","RHSA-2026:62404","RHSA-2026:62405","RHSA-2026:62406","RHSA-2026:62407","RHSA-2026:62577","RHSA-2026:62578","RHSA-2026:62602","RHSA-2026:62631","RHSA-2026:62753","RHSA-2026:62754","RHSA-2026:62803","RHSA-2026:63022","RHSA-2026:63119","RHSA-2026:63124","RHSA-2026:63127","RHSA-2026:63130","RHSA-2026:63136","RHSA-2026:63163","RHSA-2026:63332","RHSA-2026:64777","RHSA-2026:64786","RHSA-2026:64788","RHSA-2026:64818","RHSA-2026:65116","RHSA-2026:65117","RHSA-2026:65153","RHSA-2026:65335","RHSA-2026:65336","RHSA-2026:65359","RHSA-2026:65534"],"database_specific":{"review_status":"REVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-6090"},"references":[{"type":"REPORT","url":"https://go.dev/issue/80528"},{"type":"FIX","url":"https://go.dev/cl/804261"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/94pEornpRlI"}],"affected":[{"package":{"name":"stdlib","ecosystem":"Go","purl":"pkg:golang/stdlib"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.25.13"},{"introduced":"1.26.0-0"},{"fixed":"1.26.6"},{"introduced":"1.27.0-0"},{"fixed":"1.27.0-rc.3"}]}],"ecosystem_specific":{"imports":[{"path":"crypto/tls","symbols":["Conn.Handshake","Conn.HandshakeContext","Conn.Read","Conn.Write","Conn.readRecordOrCCS","Dial","DialWithDialer","Dialer.Dial","Dialer.DialContext","QUICConn.HandleData","QUICConn.Start"]}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-6090.json"}}],"schema_version":"1.9.0","credits":[{"name":"Qi Deng of Aurascape.ai"}]}