{"id":"GO-2026-6354","summary":"Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh","details":"Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection.\n\nNow, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.","aliases":["CVE-2026-78662"],"modified":"2026-09-02T19:30:10.288524721Z","published":"2026-09-02T19:12:04Z","database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-6354","review_status":"REVIEWED"},"references":[{"type":"REPORT","url":"https://go.dev/issue/81316"},{"type":"FIX","url":"https://go.dev/cl/826504"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/1y3fb2np35U"}],"affected":[{"package":{"name":"golang.org/x/crypto","ecosystem":"Go","purl":"pkg:golang/golang.org/x/crypto"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.56.0"}]}],"ecosystem_specific":{"imports":[{"path":"golang.org/x/crypto/ssh","symbols":["Dial","NewClientConn","NewControlClientConn","NewServerConn","channel.Accept","channel.handlePacket","channel.responseMessageReceived"]}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-6354.json"}}],"schema_version":"1.9.0","credits":[{"name":"Will Mortensen"}]}