{"id":"CVE-2026-97031","revision":"bd28beca175c4ac0ab7ab6cb7a1c7cd2","records":[{"revision":"bd28beca175c4ac0ab7ab6cb7a1c7cd2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97031","aliases":[],"title":"Reject malformed ECH outer extension references in crypto/tls","description":"Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.","state":0,"publishedAt":"2026-10-08T22:53:58.775+00:00","modifiedAt":"2026-10-09T15:59:17.238+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\": \"1.26.9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"1.27.0-0\",\n                            \"lessThan\": \"1.27.2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"decodeInnerClientHello\"\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.Start\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[],"references":["https://go.dev/cl/847312","https://go.dev/issue/81855","https://groups.google.com/g/golang-announce/c/U2fTuyDJznI","https://pkg.go.dev/vuln/GO-2026-6607"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97031","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97031","identifiers":["CVE-2026-97031"]},"retained":false,"historicalAffected":[]}],"coverage":[]}