rust-russh: Russh is a Rust SSH client & server library
CVE-2026-73430 is fixed in rust-russh on 1 platform by DEBIAN-CVE-2026-73430 (version 0.64.1-1), released August 12, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Russh is a Rust SSH client & server library. Prior to 0.62.4, an unauthenticated SSH client can cause a denial of service by sending SSH_MSG_KEX_ECDH_INIT with a 32-byte all-zero Q_C value. Curve25519Kex::server_dh in russh/src/kex/curve25519.rs accepts the all-zero peer public value and computes an all-zero shared secret, after which compute_exchange_hash calls encode_mpint in russh/src/kex/mod.rs and indexes beyond the end of the input while skipping leading zero bytes. The resulting panic occurs before authentication and terminates the server key-exchange task. This issue is fixed in version 0.62.4.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rust-russh · Debian 14 | 0.64.1-1 | DEBIAN-CVE-2026-73430 | Aug 12, 2026 |
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