{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-56862","assignerOrgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","state":"PUBLISHED","assignerShortName":"Go","dateReserved":"2026-06-23T15:10:49.353Z","datePublished":"2026-08-13T21:58:53.216Z","dateUpdated":"2026-08-14T15:29:41.741Z"},"containers":{"cna":{"providerMetadata":{"orgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","shortName":"Go","dateUpdated":"2026-08-13T21:58:53.216Z"},"title":"Limit handshake messages we are willing to accept post-handshake in crypto/tls","descriptions":[{"lang":"en","value":"Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely."}],"affected":[{"vendor":"Go standard library","product":"crypto/tls","collectionURL":"https://pkg.go.dev","packageName":"crypto/tls","versions":[{"version":"0","lessThan":"1.25.13","status":"affected","versionType":"semver"},{"version":"1.26.0-0","lessThan":"1.26.6","status":"affected","versionType":"semver"},{"version":"1.27.0-0","lessThan":"1.27.0-rc.3","status":"affected","versionType":"semver"}],"programRoutines":[{"name":"Conn.readRecordOrCCS"},{"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.Start"}],"defaultStatus":"unaffected"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling"}]}],"references":[{"url":"https://go.dev/issue/80528"},{"url":"https://go.dev/cl/804261"},{"url":"https://groups.google.com/g/golang-announce/c/94pEornpRlI"},{"url":"https://pkg.go.dev/vuln/GO-2026-6090"}],"credits":[{"lang":"en","value":"Qi Deng of Aurascape.ai"}]},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-770","lang":"en","description":"CWE-770 Allocation of Resources Without Limits or Throttling"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-08-14T15:27:34.651997Z","id":"CVE-2026-56862","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":"2026-08-14T15:29:41.741Z"}}]}}