{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.4.3"
              },
              {
                "introduced": "Ech0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "b934467d26b91c96dc7c937b6a4e47d8d01484eb"
            }
          ],
          "repo": "https://github.com/lin-snow/ech0",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-r2x7-427f-rq69"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79671.json"
  },
  "details": "Ech0 before 4.4.3 contains a server-side request forgery vulnerability in the validateWebhookURL function (webhook_setting_service.go), which only validates literal IP addresses via net.ParseIP() and fails to reject hostnames that DNS-resolve to private or internal IPs (e.g., 169.254.169.254.nip.io). An attacker with admin privileges can create a webhook with such a hostname to bypass validation and cause the server to make requests to internal services, cloud metadata endpoints, and private network resources. The issue is fixed in 4.4.3.",
  "id": "CVE-2026-79671",
  "modified": "2026-08-31T03:30:59.857704588Z",
  "published": "2026-08-25T11:33:32.174Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79671.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-r2x7-427f-rq69"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-79671"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/ech0-before-ssrf-via-dns-resolution-bypass"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Ech0 before 4.4.3 SSRF via DNS Resolution Bypass"
}