{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.5.0"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "471e17dc0d68233db84db11be82c9f62f4661214"
            }
          ],
          "repo": "https://git.samba.org/rsync.git/",
          "type": "GIT"
        },
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "3.4.4"
              },
              {
                "fixed": "3.5.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "471e17dc0d68233db84db11be82c9f62f4661214"
            }
          ],
          "repo": "https://github.com/rsyncproject/rsync",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h2q9-5fr8-w635"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-290"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53791.json"
  },
  "details": "rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a spoofed source IP in the PROXY protocol header to circumvent hosts allow/deny rules, gaining unauthorized access that would otherwise be blocked based on their real source address.",
  "id": "CVE-2026-53791",
  "modified": "2026-09-02T03:30:45.057313842Z",
  "published": "2026-08-13T14:38:10.300Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53791.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/RsyncProject/rsync/releases/tag/v3.5.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-h2q9-5fr8-w635"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53791"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/rsync-daemon-ip-spoofing-via-proxy-protocol-header"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/RsyncProject/rsync"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "rsync \u003c 3.5.0 Daemon IP Spoofing via PROXY Protocol Header"
}