{"id":"CVE-2026-48108","summary":"Russh: SSH identification parsing accepted non-canonical client banners and did not bound pre-banner input","details":"Russh is a Rust SSH client & server library. From version 0.34.0-beta.1 to before version 0.61.0, russh did not enforce the SSH identification-string rules as deliberately as OpenSSH. In particular, the server-side identification reader used the same permissive path as the client, allowing pre-banner lines from clients, and the reader did not enforce a bounded number of pre-banner lines. For a library server built on russh, this could allow a remote peer to hold connection setup resources in the cleartext pre-authentication phase with malformed identification input that should have been rejected early. This issue has been patched in version 0.61.0.","aliases":["GHSA-76r6-x97p-67vr"],"modified":"2026-08-12T03:51:47.543422119Z","published":"2026-06-10T20:24:56.666Z","database_specific":{"cwe_ids":["CWE-20"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48108.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48108.json"},{"type":"ADVISORY","url":"https://github.com/Eugeny/russh/security/advisories/GHSA-76r6-x97p-67vr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48108"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/eugeny/russh","events":[{"introduced":"0"},{"fixed":"1947d6b1bb3a9d79840b5adf7eb9b33df2c6e4a7"}],"database_specific":{"extracted_events":[{"introduced":"0.34.0-beta.1"},{"fixed":"0.61.0"},{"introduced":"0"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v0.60.3","v0.60.2","v0.60.1","v0.60.0","v0.59.0","v0.58.0","v0.57.1","v0.57.0","v0.56.0","v0.55.0","v0.54.6","v0.54.5","v0.54.4","v0.54.3","v0.54.2","v0.54.1","v0.54.0","v0.53.0","v0.53.0-beta.1","v0.52.1","v0.52.0","v0.52.0-beta.1","v0.51.1","v0.51.0","v0.51.0-beta.3","v0.51.0-beta.2","v0.51.0-beta.1","v0.50.4","v0.50.3","v0.50.1","v0.50.0","v0.50.0-beta.12","v0.50.0-beta.11","v0.50.0-beta.10","v0.50.0-beta.9","v0.50.0-beta.8","v0.50.0-beta.7","v0.50.0-beta.6","v0.50.0-beta.5","v0.50.0-beta.4","v0.50.0-beta.3","v0.50.0-beta.2","v0.49.0","v0.48.2","v0.48.1","v0.48.0","v0.47.0-beta.4","v0.47.0-beta.3","v0.46.0","v0.45.0","v0.44.0","v0.44.0-beta.4","v0.44.0-beta.3","v0.44.0-beta.1","v0.43.0","v0.43.0-beta.1","v0.42.0","v0.40.2","v0.40.1","v0.40.0","v0.38.0","v0.39.0-beta.1","v0.38.0-beta.1","v0.37.1","v0.37.0","v0.36.1","v0.37.0-beta.1","0.37.0-beta.1","v0.35.0-beta.9","v0.35.0-beta.8","v0.35.0-beta.7","v0.35.0-beta.6","v0.35.0-beta.5","v0.35.0-beta.3","v0.35.0-beta.2","v0.35.0-beta.1","v0.34.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48108.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}