{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.62.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a7fc1eb5717264e31c3c5f7dd849b73989a08f3d"
            },
            {
              "fixed": "0089c89c94753bebbec12b956c07a1cd38740379"
            }
          ],
          "repo": "https://github.com/eugeny/russh",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5xvq-cp9x-6p6r"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-754"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73430.json"
  },
  "details": "Russh is a Rust SSH client \u0026 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.",
  "id": "CVE-2026-73430",
  "modified": "2026-09-11T03:31:02.177437506Z",
  "published": "2026-08-12T20:55:38.202Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Eugeny/russh/releases/tag/v0.62.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73430.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-5xvq-cp9x-6p6r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73430"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Eugeny/russh/commit/a7fc1eb5717264e31c3c5f7dd849b73989a08f3d"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)"
}