{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0.162.0"
              },
              {
                "fixed": "0.163.1"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "076dfe13d0f789e3d9586b192f8f7f3329c26990"
            },
            {
              "fixed": "2a4fd58818ffdf45bbb2a97ab119bb4c46cd93f0"
            },
            {
              "fixed": "a00b5c72ac57afe26df6688ece3ca544a56df372"
            }
          ],
          "repo": "https://github.com/gohugoio/hugo",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-r46f-3rpw-hxrv"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58404.json"
  },
  "details": "Hugo is a static site generator. From v0.162.0 through v0.163.0, the default security.http.urls policy denies requests to loopback, internal, and cloud-metadata IPv4 literals, but the deny rule only matched dotted-decimal notation, so alternate IPv4 encodings of the same addresses, including integer, hex, or octal, passed the policy. When a template passes an untrusted or data-derived URL to resources.GetRemote and the host platform uses the cgo system resolver, these encodings resolve to the blocked address, allowing build-time server-side requests to loopback and internal services, including the cloud-metadata endpoint in hosted or CI builds; the same check is reused on redirects, so the gap also applies to each redirect hop. This issue is fixed in v0.163.1.",
  "id": "CVE-2026-58404",
  "modified": "2026-08-12T03:51:17.268917081Z",
  "published": "2026-07-06T19:16:15.945Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gohugoio/hugo/releases/tag/v0.163.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58404.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58404"
    },
    {
      "type": "FIX",
      "url": "https://github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372"
    },
    {
      "type": "FIX",
      "url": "https://github.com/gohugoio/hugo/pull/15020"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Hugo security.http.urls deny rules bypassed by alternate IPv4 encodings"
}