CVE-2026-73430 - Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)
Brief
CVE ID : CVE-2026-73430
Published : Aug. 12, 2026, 8:55 p. m.
- 9 minutes ago
Description : Russh is a Rust SSH client & server library. Prior to 0.
- 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.
- 4.
Severity: 0.0
- NA
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