{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.53.0"
              },
              {
                "fixed": "0.70.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "051299ec25638895e36779c305abf554671b4f68"
            },
            {
              "fixed": "7dc7be930e2452ae93fd32f2a77f8c6fcd0b652b"
            },
            {
              "fixed": "fa3bcca2b0c4753cd4f0e2ab189dd6a5a6a15708"
            }
          ],
          "repo": "https://github.com/fatedier/frp",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-26gq-p25f-99cp"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-129",
      "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73564.json"
  },
  "details": "frp is a fast reverse proxy. From 0.53.0 until 0.70.1, frp's optional SSH Tunnel Gateway in pkg/ssh/server.go parses an SSH exec channel request by adding 4 to an attacker-controlled four-byte big-endian length. A length of 0xFFFFFFFF makes the uint32 addition wrap to 3, defeats the payload bounds check, and causes payload[4:3] to panic in TunnelServer.handleNewChannel. When no authorized-keys file is configured, sshConfig.NoClientAuth permits an unauthenticated peer to reach this channel phase before the frp token is checked, so a single five-byte request terminates the frps process and drops every active tunnel. This issue is fixed in version 0.70.1.",
  "id": "CVE-2026-73564",
  "modified": "2026-08-15T11:31:24.384208386Z",
  "published": "2026-08-13T17:35:46.762Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fatedier/frp/releases/tag/v0.70.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73564.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/fatedier/frp/security/advisories/GHSA-26gq-p25f-99cp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73564"
    },
    {
      "type": "FIX",
      "url": "https://github.com/fatedier/frp/commit/7dc7be930e2452ae93fd32f2a77f8c6fcd0b652b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/fatedier/frp/pull/5428"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "frp: Unauthenticated Remote Denial of Service in the frp SSH Tunnel Gateway via Integer Overflow"
}