{"id":"CVE-2026-78662","state":"PUBLISHED","title":"Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh","description":"Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.","publishedAt":"2026-09-02T19:37:05.741Z","updatedAt":"2026-09-03T13:20:12.263Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"CISA-ADP"},"assigner":"Go","products":["golang.org/x/crypto golang.org/x/crypto/ssh"],"affected":[{"vendor":"golang.org/x/crypto","product":"golang.org/x/crypto/ssh","packageName":"golang.org/x/crypto/ssh","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.56.0","versionType":"semver"}],"collectionURL":"https://pkg.go.dev","programRoutines":[{"name":"channel.handlePacket"},{"name":"channel.responseMessageReceived"},{"name":"channel.Accept"},{"name":"Dial"},{"name":"NewClientConn"},{"name":"NewControlClientConn"},{"name":"NewServerConn"}]}],"references":["https://go.dev/issue/81316","https://go.dev/cl/826504","https://groups.google.com/g/golang-announce/c/1y3fb2np35U","https://pkg.go.dev/vuln/GO-2026-6354"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/78xxx/CVE-2026-78662.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-78662","state":"PUBLISHED","datePublished":"2026-09-02T19:37:05.741Z","dateUpdated":"2026-09-03T13:20:12.263Z","assignerShortName":"Go","assignerOrgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","dateReserved":"2026-08-24T23:36:15.738Z"},"containers":{"cna":{"title":"Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh","descriptions":[{"lang":"en","value":"Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection."}],"affected":[{"vendor":"golang.org/x/crypto","product":"golang.org/x/crypto/ssh","packageName":"golang.org/x/crypto/ssh","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.56.0","versionType":"semver"}],"collectionURL":"https://pkg.go.dev","programRoutines":[{"name":"channel.handlePacket"},{"name":"channel.responseMessageReceived"},{"name":"channel.Accept"},{"name":"Dial"},{"name":"NewClientConn"},{"name":"NewControlClientConn"},{"name":"NewServerConn"}]}],"references":[{"url":"https://go.dev/issue/81316"},{"url":"https://go.dev/cl/826504"},{"url":"https://groups.google.com/g/golang-announce/c/1y3fb2np35U"},{"url":"https://pkg.go.dev/vuln/GO-2026-6354"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling"}]}],"providerMetadata":{"shortName":"Go","orgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","dateUpdated":"2026-09-02T19:37:05.741Z"},"credits":[{"lang":"en","value":"Will Mortensen"}]},"adp":[{"title":"CISA ADP Vulnrichment","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:H/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-03T13:19:47.340520Z","id":"CVE-2026-78662","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","type":"CWE","lang":"en","description":"CWE-770 Allocation of Resources Without Limits or Throttling"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-03T13:20:12.263Z"}}]}}}