UBUNTU-CVE-2026-111062

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UBUNTU-CVE-2026-111062

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2026-111062, https://www.cve.org/CVERecord?id=CVE-2026-111062, https://github.com/Eugeny/russh/commit/a0ded76bdc352f8fbeaaeb175fb2a0c586fbc8f2, https://github.com/Eugeny/russh/pull/759, https://github.com/Eugeny/russh/releases/tag/v0.64.0, https://github.com/Eugeny/russh/security/advisories/GHSA-j7h2-66j4-ghjf