{"id":"CVE-2026-42505","revision":"ea93f05cb6b341cb9471b949e8dc4ec6","records":[{"revision":"ea93f05cb6b341cb9471b949e8dc4ec6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-42505","aliases":[],"title":"Invoking Encrypted Client Hello privacy leak in crypto/tls","description":"Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.","state":0,"publishedAt":"2026-07-08T15:46:33.407+00:00","modifiedAt":"2026-07-08T19:38:17.603+00:00","affected":[{"ecosystem":"https://pkg.go.dev","name":"crypto/tls","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Go standard library\",\n                    \"product\": \"crypto/tls\",\n                    \"collectionURL\": \"https://pkg.go.dev\",\n                    \"packageName\": \"crypto/tls\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"1.25.12\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"1.26.0-0\",\n                            \"lessThan\": \"1.26.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"1.27.0-0\",\n                            \"lessThan\": \"1.27.0-rc.2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"clientHelloMsg.marshalMsg\"\n                        },\n                        {\n                            \"name\": \"Conn.Handshake\"\n                        },\n                        {\n                            \"name\": \"Conn.HandshakeContext\"\n                        },\n                        {\n                            \"name\": \"Conn.Read\"\n                        },\n                        {\n                            \"name\": \"Conn.Write\"\n                        },\n                        {\n                            \"name\": \"Dial\"\n                        },\n                        {\n                            \"name\": \"DialWithDialer\"\n                        },\n                        {\n                            \"name\": \"Dialer.Dial\"\n                        },\n                        {\n                            \"name\": \"Dialer.DialContext\"\n                        },\n                        {\n                            \"name\": \"QUICConn.HandleData\"\n                        },\n                        {\n                            \"name\": \"QUICConn.SendSessionTicket\"\n                        },\n                        {\n                            \"name\": \"QUICConn.Start\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[],"references":["https://go.dev/cl/775960","https://go.dev/issue/79282","https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc","https://pkg.go.dev/vuln/GO-2026-5856"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-42505","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-42505","identifiers":["CVE-2026-42505"]},"retained":false,"historicalAffected":[]}],"coverage":[]}