{"id":"EUVD-2026-70267","revision":null,"records":[{"revision":"05ff3d42672c49bc88e4824f199ff5ff","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-56855","aliases":[],"title":"Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh","description":"Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.","state":0,"publishedAt":"2026-09-02T19:37:05.807+00:00","modifiedAt":"2026-09-03T14:14:40.169+00:00","affected":[{"ecosystem":"https://pkg.go.dev","name":"golang.org/x/crypto/ssh","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"golang.org/x/crypto\",\n                    \"product\": \"golang.org/x/crypto/ssh\",\n                    \"collectionURL\": \"https://pkg.go.dev\",\n                    \"packageName\": \"golang.org/x/crypto/ssh\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"0.56.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"channel.handlePacket\"\n                        },\n                        {\n                            \"name\": \"Dial\"\n                        },\n                        {\n                            \"name\": \"NewClientConn\"\n                        },\n                        {\n                            \"name\": \"NewControlClientConn\"\n                        },\n                        {\n                            \"name\": \"NewServerConn\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[],"references":["https://go.dev/issue/81317","https://go.dev/cl/826524","https://groups.google.com/g/golang-announce/c/1y3fb2np35U","https://pkg.go.dev/vuln/GO-2026-6355"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-56855","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-56855","identifiers":["CVE-2026-56855"]},"retained":false,"historicalAffected":[]},{"revision":"9ce1f2846de44998b5065fd692208c47","observedAt":"2026-11-11T14:07:34.985+00:00","statement":{"source":"euvd","id":"EUVD-2026-70267","aliases":["CVE-2026-56855"],"title":"Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all …","description":"Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://go.dev/issue/81317","https://go.dev/cl/826524","https://groups.google.com/g/golang-announce/c/1y3fb2np35U","https://pkg.go.dev/vuln/GO-2026-6355"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-70267","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 2, 2026, 7:37:05 PM","dateUpdated":"Sep 3, 2026, 2:14:40 PM"},"relatedAdvisories":[{"id":"SUSE-SU-2026:4292-1","title":"Security update for 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