{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42505", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-04-28T00:21:12.792Z", "datePublished": "2026-07-08T15:46:33.407Z", "dateUpdated": "2026-07-08T19:38:17.603Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-07-08T15:46:33.407Z"}, "title": "Invoking Encrypted Client Hello privacy leak in crypto/tls", "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"vendor": "Go standard library", "product": "crypto/tls", "collectionURL": "https://pkg.go.dev", "packageName": "crypto/tls", "versions": [{"version": "0", "lessThan": "1.25.12", "status": "affected", "versionType": "semver"}, {"version": "1.26.0-0", "lessThan": "1.26.5", "status": "affected", "versionType": "semver"}, {"version": "1.27.0-0", "lessThan": "1.27.0-rc.2", "status": "affected", "versionType": "semver"}], "programRoutines": [{"name": "clientHelloMsg.marshalMsg"}, {"name": "Conn.Handshake"}, {"name": "Conn.HandshakeContext"}, {"name": "Conn.Read"}, {"name": "Conn.Write"}, {"name": "Dial"}, {"name": "DialWithDialer"}, {"name": "Dialer.Dial"}, {"name": "Dialer.DialContext"}, {"name": "QUICConn.HandleData"}, {"name": "QUICConn.SendSessionTicket"}, {"name": "QUICConn.Start"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-201: Insertion of Sensitive Information Into Sent Data"}]}], "references": [{"url": "https://go.dev/cl/775960"}, {"url": "https://go.dev/issue/79282"}, {"url": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc"}, {"url": "https://pkg.go.dev/vuln/GO-2026-5856"}], "credits": [{"lang": "en", "value": "Coia Prant (github.com/rbqvq)"}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-201", "lang": "en", "description": "CWE-201 Insertion of Sensitive Information Into Sent Data"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-07-08T18:03:53.821942Z", "id": "CVE-2026-42505", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-08T19:38:17.603Z"}}]}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.25.12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.26.0-0,1.26.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.27.0-0,1.27.0-rc.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "crypto/tls", "source": "cna", "vendor": "Go standard library"}, "product": "crypto_tls", "vendor": "go_standard_library"}], "created": "2026-07-08T18:15:06.192810+00:00", "updated": "2026-07-08T18:15:06.192852+00:00", "vendors": ["go_standard_library", "go_standard_library$PRODUCT$crypto_tls"]}