{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97031", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-09-23T23:03:36.988Z", "datePublished": "2026-10-08T22:53:58.775Z", "dateUpdated": "2026-10-08T22:53:58.775Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-10-08T22:53:58.775Z"}, "title": "Reject malformed ECH outer extension references in crypto/tls", "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"vendor": "Go standard library", "product": "crypto/tls", "collectionURL": "https://pkg.go.dev", "packageName": "crypto/tls", "versions": [{"version": "0", "lessThan": "1.26.9", "status": "affected", "versionType": "semver"}, {"version": "1.27.0-0", "lessThan": "1.27.2", "status": "affected", "versionType": "semver"}], "programRoutines": [{"name": "decodeInnerClientHello"}, {"name": "Conn.Handshake"}, {"name": "Conn.HandshakeContext"}, {"name": "Conn.Read"}, {"name": "Conn.Write"}, {"name": "Dial"}, {"name": "DialWithDialer"}, {"name": "Dialer.Dial"}, {"name": "Dialer.DialContext"}, {"name": "QUICConn.Start"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-405: Asymmetric Resource Consumption"}]}], "references": [{"url": "https://go.dev/cl/847312"}, {"url": "https://go.dev/issue/81855"}, {"url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"}, {"url": "https://pkg.go.dev/vuln/GO-2026-6607"}]}}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "packageName": "crypto/tls", "product": "crypto/tls", "programRoutines": [{"name": "decodeInnerClientHello"}, {"name": "Conn.Handshake"}, {"name": "Conn.HandshakeContext"}, {"name": "Conn.Read"}, {"name": "Conn.Write"}, {"name": "Dial"}, {"name": "DialWithDialer"}, {"name": "Dialer.Dial"}, {"name": "Dialer.DialContext"}, {"name": "QUICConn.Start"}], "vendor": "Go standard library", "versions": [{"lessThan": "1.26.9", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "1.27.2", "status": "affected", "version": "1.27.0-0", "versionType": "semver"}]}], "source": "security@golang.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-97031", "lastModified": "2026-10-08T23:17:06.037", "metrics": {}, "published": "2026-10-08T23:17:06.037", "references": [{"source": "security@golang.org", "url": "https://go.dev/cl/847312"}, {"source": "security@golang.org", "url": "https://go.dev/issue/81855"}, {"source": "security@golang.org", "url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"}, {"source": "security@golang.org", "url": "https://pkg.go.dev/vuln/GO-2026-6607"}], "sourceIdentifier": "security@golang.org", "vulnStatus": "Received"}

{}

{}