CVE-2026-111062
A russh SSH server accepts a publickey authentication whose signature uses a different algorithm than the one named in the request
russh is a Rust SSH client and server library. From version 0.34.0-beta.1 until version 0.64.0, its SSH server does not require the signature algorithm in a public-key authentication signature to match the algorithm named in the authentication request. A client possessing an authorized RSA private key can announce rsa-sha2-512 while supplying a valid ssh-rsa SHA-1 signature, bypassing restrictions or producing misleading audit records when applications rely on the requested algorithm. A valid private-key signature remains required, and russh clients are not affected. This issue is fixed in version 0.64.0.
| CWE | CWE-347 |
| Vendor | eugeny |
| Product | russh |
| Published | Nov 5, 2026 |
| Last Updated | Nov 5, 2026 |
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