CVE-2026-73429 - Russh: client wrong-length X25519 `clone_from_slice` panic (pre-auth DoS)
Brief
CVE ID : CVE-2026-73429
Published : Aug. 12, 2026, 8:53 p. m.
- 11 minutes ago
Description : Russh is a Rust SSH client & server library. Prior to 0.
- 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.
- 4.
Severity: 0.0
- NA
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