CVE-2026-73429

Description

Russh is a Rust SSH client & server library. Prior to 0.62.4, a malicious SSH server can crash a russh client session with a malformed KEX_ECDH_REPLY containing a server ephemeral value that is not 32 bytes long. The client-side Curve25519Kex::compute_shared_secret function in russh/src/kex/curve25519.rs passes the decoded exchange.server_ephemeral value to clone_from_slice without validating its length, causing a deterministic panic before the server host key is verified. The panic terminates the spawned client session task and surfaces as a JoinError, while the embedding process normally remains running. This issue is fixed in version 0.62.4.

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Produits concernés

• Eugeny russh

Scores CVSS

Faiblesses (CWE)

• CWE-704
• CWE-754

Références

• https://github.com/Eugeny/russh/commit/a7fc1eb5717264e31c3c5f7dd849b73989a08f3d
• https://github.com/Eugeny/russh/releases/tag/v0.62.4
• https://github.com/Eugeny/russh/security/advisories/GHSA-g9hv-x236-4qp3
• https://github.com/Eugeny/russh/security/advisories/GHSA-g9hv-x236-4qp3

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories