Hugo v0.162.0 before v0.166.0 IP-literal Deny Rule Bypass

{
  "id": "a84416f43c065135c5a132f2cf4561bc4867af9d3ed3edaff04f20afd4d67d08",
  "url": "https://osv.dev/vulnerability/CVE-2026-100693",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Hugo v0.162.0 before v0.166.0 IP-literal Deny Rule Bypass",
    "summary": "Hugo versions from v0.162.0 before v0.166.0 contain a case-sensitive validation flaw in the security.http.urls IP-literal deny rule that allows attackers to bypass restrictions. Attackers can use mixed-case URL schemes in resources.GetRemote calls to fetch from restricted IP addresses like localhost.",
    "evidence": "osv:CVE-2026-100693",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-100693",
      "aliases": [
        "CVE-2026-100693",
        "GHSA-pmrv-x7gp-2rjw"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/gohugoio/hugo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "076dfe13d0f789e3d9586b192f8f7f3329c26990"
                },
                {
                  "fixed": "78400b4de8adc99273d3e674ed6c4d14c3bdf669"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.162.0"
                      },
                      {
                        "fixed": "0.166.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.162.0"
                      },
                      {
                        "fixed": "0.166.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.165.0",
            "v0.164.0",
            "v0.163.3",
            "v0.163.2",
            "v0.163.1",
            "v0.163.0",
            "v0.162.1",
            "v0.162.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100693.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.987366542Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100693.json",
        "https://github.com/gohugoio/hugo/security/advisories/GHSA-pmrv-x7gp-2rjw",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100693",
        "https://www.vulncheck.com/advisories/hugo-0.162.0-before-0.166.0-ip-literal-deny-rule-bypass"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-178"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100693.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100693",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495700,
  "published_at": "2026-09-26T13:23:51.556+00:00"
}