{"schema_version":"1.7.5","id":"GO-2026-4870","published":"2026-04-07T22:53:49Z","modified":"2026-08-27T10:40:55.556559918Z","aliases":["BIT-golang-2026-32283","CVE-2026-32283"],"related":["CGA-w7vv-7vph-696h","RHSA-2026:10217","RHSA-2026:10219","RHSA-2026:10704","RHSA-2026:11507","RHSA-2026:11514","RHSA-2026:11704","RHSA-2026:11711","RHSA-2026:11712","RHSA-2026:11863","RHSA-2026:11881","RHSA-2026:14200","RHSA-2026:15980","RHSA-2026:16021","RHSA-2026:16024","RHSA-2026:16101","RHSA-2026:16102","RHSA-2026:16875","RHSA-2026:17075","RHSA-2026:17084","RHSA-2026:17287","RHSA-2026:18027","RHSA-2026:18032","RHSA-2026:19126","RHSA-2026:19132","RHSA-2026:19133","RHSA-2026:19134","RHSA-2026:19135","RHSA-2026:19136","RHSA-2026:19137","RHSA-2026:19139","RHSA-2026:19144","RHSA-2026:19156","RHSA-2026:19350","RHSA-2026:19351","RHSA-2026:19352","RHSA-2026:19353","RHSA-2026:19369","RHSA-2026:19450","RHSA-2026:19550","RHSA-2026:19634","RHSA-2026:19714","RHSA-2026:19715","RHSA-2026:19719","RHSA-2026:19720","RHSA-2026:19721","RHSA-2026:19722","RHSA-2026:19750","RHSA-2026:19839","RHSA-2026:20556","RHSA-2026:20569","RHSA-2026:20570","RHSA-2026:20571","RHSA-2026:20607","RHSA-2026:20608","RHSA-2026:20609","RHSA-2026:22450","RHSA-2026:22709","RHSA-2026:22713","RHSA-2026:22714","RHSA-2026:22937","RHSA-2026:23102","RHSA-2026:23103","RHSA-2026:23228","RHSA-2026:24337","RHSA-2026:24470","RHSA-2026:24761","RHSA-2026:24762","RHSA-2026:25248","RHSA-2026:25250","RHSA-2026:25251","RHSA-2026:25252","RHSA-2026:26447","RHSA-2026:27076","RHSA-2026:28038","RHSA-2026:28047","RHSA-2026:28074","RHSA-2026:29035","RHSA-2026:29195","RHSA-2026:29455","RHSA-2026:29703","RHSA-2026:33722","RHSA-2026:34192","RHSA-2026:34196","RHSA-2026:34197","RHSA-2026:34365","RHSA-2026:36796","RHSA-2026:39810","RHSA-2026:41019","RHSA-2026:47712","RHSA-2026:47714","RHSA-2026:47716","RHSA-2026:47719","RHSA-2026:47721","RHSA-2026:47722","RHSA-2026:47910","RHSA-2026:48036","RHSA-2026:48790","RHSA-2026:49509","RHSA-2026:49600","RHSA-2026:49944","RHSA-2026:51288","RHSA-2026:54191","RHSA-2026:54757","RHSA-2026:56910","RHSA-2026:7291","RHSA-2026:7385"],"summary":"Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls","details":"If one side of the TLS connection sends multiple key update messages post-handshake in a single record, the connection can deadlock, causing uncontrolled consumption of resources. This can lead to a denial of service.\n\nThis only affects TLS 1.3.","affected":[{"package":{"name":"stdlib","ecosystem":"Go","purl":"pkg:golang/stdlib"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.25.9"},{"introduced":"1.26.0-0"},{"fixed":"1.26.2"}]}],"ecosystem_specific":{"imports":[{"path":"crypto/tls","symbols":["Conn.Handshake","Conn.HandshakeContext","Conn.Read","Conn.Write","Conn.handleKeyUpdate","Dial","DialWithDialer","Dialer.Dial","Dialer.DialContext","QUICConn.HandleData","QUICConn.Start","clientHandshakeStateTLS13.establishHandshakeKeys","clientHandshakeStateTLS13.readServerFinished","serverHandshakeStateTLS13.readClientFinished","serverHandshakeStateTLS13.sendServerParameters"]}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-4870.json"}}],"references":[{"type":"FIX","url":"https://go.dev/cl/763767"},{"type":"REPORT","url":"https://go.dev/issue/78334"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"}],"database_specific":{"review_status":"REVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-4870"},"credits":[{"name":"Jakub Ciolek - https://ciolek.dev/"}]}