CVE-2026-73430

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{"affected": [{"affectedData": [{"product": "russh", "vendor": "Eugeny", "versions": [{"status": "affected", "version": "< 0.62.4"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Russh es una biblioteca SSH de cliente y servidor de Rust. Antes de la versi\u00f3n 0.62.4, un cliente SSH no autenticado puede causar una denegaci\u00f3n de servicio al enviar SSH_MSG_KEX_ECDH_INIT con un valor Q_C de 32 bytes todo ceros. Curve25519Kex::server_dh en russh/src/kex/curve25519.rs acepta el valor p\u00fablico del par todo ceros y calcula un secreto compartido todo ceros, despu\u00e9s de lo cual compute_exchange_hash llama a encode_mpint en russh/src/kex/mod.rs e indexa m\u00e1s all\u00e1 del final de la entrada mientras omite los bytes cero iniciales. El p\u00e1nico resultante ocurre antes de la autenticaci\u00f3n y termina la tarea de intercambio de claves del servidor. Este problema est\u00e1 solucionado en la versi\u00f3n 0.62.4."}], "id": "CVE-2026-73430", "lastModified": "2026-10-24T15:10:00.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-73430", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-13T17:49:19.811444Z", "version": "2.0.3"}}]}, "published": "2026-08-12T21:17:41.883", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/commit/a7fc1eb5717264e31c3c5f7dd849b73989a08f3d"}, {"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/releases/tag/v0.62.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-5xvq-cp9x-6p6r"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-754"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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