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CVE-2026-73430
MEDIUM(5.3)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Risk Signal Score23/100 — NIEDRIG
- CVSS 5.3 — Mittel
- Weniger als 24 Stunden alt
Beschreibung
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.
GitHub Advisories
GHSA-5xvq-cp9x-6p6rMEDIUM
Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)
rust/russh→ 0.62.4
GitHub Advisory