Vulnerability-Lookup

CVE-2026-58404 (GCVE-0-2026-58404)

Vulnerability from cvelistv5 – Published: 2026-07-06 19:16 – Updated: 2026-07-07 15:08

Title

Hugo security.http.urls deny rules bypassed by alternate IPv4 encodings

Summary

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.

Severity

4.6 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-07 15:08 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/gohugoio/hugo/security/advisor…	x_refsource_CONFIRM
https://github.com/gohugoio/hugo/pull/15020	x_refsource_MISC
https://github.com/gohugoio/hugo/commit/a00b5c72a…	x_refsource_MISC
https://github.com/gohugoio/hugo/releases/tag/v0.163.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
gohugoio	hugo	Affected: >= v0.162.0, < v0.163.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-58404

Vulnerability from fkie_nvd - Published: 2026-07-06 20:16 - Updated: 2026-07-08 03:05

Severity

6.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372	Patch
security-advisories@github.com	https://github.com/gohugoio/hugo/pull/15020	Issue Tracking
security-advisories@github.com	https://github.com/gohugoio/hugo/releases/tag/v0.163.1	Release Notes
security-advisories@github.com	https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv	Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	gohugo	hugo	*

JSON

To clipboard

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    }
  ],
  "id": "CVE-2026-58404",
  "lastModified": "2026-07-08T03:05:00.160",
  "metrics": {
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            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-07T15:08:15.371330Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-06T20:16:38.307",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/gohugoio/hugo/pull/15020"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/gohugoio/hugo/releases/tag/v0.163.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-R46F-3RPW-HXRV

Vulnerability from github – Published: 2026-06-19 19:18 – Updated: 2026-06-19 19:18

Summary

Hugo: security.http.urls deny rules bypassed by alternate IPv4 encodings (SSRF)

Details

Impact

The default security.http.urls policy denies requests to loopback, internal, and cloud-metadata IPv4 literals (e.g. http://127.0.0.1/, http://169.254.169.254/). The deny rule only matched dotted-decimal notation, so alternate IPv4 encodings of the same addresses — integer, hex, or octal, which contain no dot — passed the policy:

http://2130706433/ → 127.0.0.1
http://2852039166/ → 169.254.169.254 (cloud metadata)
http://0x7f000001/, http://017700000001/, http://0/

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/CI builds. The same check is reused on redirects, so the gap also applies to each redirect hop.

This affects sites that rely on security.http.urls as a security boundary while fetching attacker-influenced remote URLs; it does not affect sites that fully trust the URLs they fetch.

### Patches

Fixed in v0.163.1. Integer/hex/octal IPv4 hosts are now canonicalized to dotted-decimal before the policy is applied, so every encoding of an address is treated alike. No configuration change is required.

### Workarounds

Avoid passing untrusted URLs to resources.GetRemote, or tighten security.http.urls to an explicit allow-list of trusted hosts.

### Affected versions

v0.162.0 – v0.163.0 (patched in v0.163.1).

Severity

7.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gohugoio/hugo"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.162.0"
            },
            {
              "fixed": "0.163.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T19:18:14Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\n  The default `security.http.urls` policy denies requests to loopback, internal,\n  and cloud-metadata IPv4 literals (e.g. `http://127.0.0.1/`,\n  `http://169.254.169.254/`). The deny rule only matched dotted-decimal notation,\n  so alternate IPv4 encodings of the same addresses \u2014 integer, hex, or octal,\n  which contain no dot \u2014 passed the policy:\n\n  - `http://2130706433/` \u2192 `127.0.0.1`\n  - `http://2852039166/` \u2192 `169.254.169.254` (cloud metadata)\n  - `http://0x7f000001/`, `http://017700000001/`, `http://0/`\n\n  When a template passes an untrusted or data-derived URL to\n  `resources.GetRemote` and the host platform uses the\n  cgo system resolver, these encodings resolve to the blocked address \u2014 allowing\n  build-time server-side requests to loopback and internal services, including the\n  cloud-metadata endpoint in hosted/CI builds. The same check is reused on\n  redirects, so the gap also applies to each redirect hop.\n\n  This affects sites that rely on `security.http.urls` as a security boundary\n  while fetching attacker-influenced remote URLs; it does not affect sites that\n  fully trust the URLs they fetch.\n\n  ### Patches\n\n  Fixed in **v0.163.1**. Integer/hex/octal IPv4 hosts are now canonicalized to\n  dotted-decimal before the policy is applied, so every encoding of an address is\n  treated alike. No configuration change is required.\n\n  ### Workarounds\n\n  Avoid passing untrusted URLs to `resources.GetRemote`, or\n  tighten `security.http.urls` to an explicit allow-list of trusted hosts.\n\n  ### Affected versions\n\n  v0.162.0 \u2013 v0.163.0 (patched in v0.163.1).",
  "id": "GHSA-r46f-3rpw-hxrv",
  "modified": "2026-06-19T19:18:14Z",
  "published": "2026-06-19T19:18:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gohugoio/hugo"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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 (SSRF)"
}

RHSA-2026:36862

Vulnerability from csaf_redhat - Published: 2026-07-08 20:16 - Updated: 2026-09-08 00:06

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Scope

4 vulnerabilities in this advisory, including CVE-2026-58404.

CVE-2026-58404

A flaw was found in Hugo, a static site generator. The default security policy intended to deny requests to loopback, internal, and cloud-metadata IPv4 addresses could be bypassed. This occurred because the deny rule only matched dotted-decimal notation, allowing alternate IPv4 encodings (integer, hex, or octal) to pass the policy. When a template processes an untrusted URL, this vulnerability could lead to Server-Side Request Forgery (SSRF), enabling access to internal services or cloud-metadata endpoints during the build process.

6.8 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:36862

Open the full advisory

ubuntu-cve-2026-58404

Vulnerability from osv_ubuntu

Published

2026-07-06 20:16

Modified

2026-07-06 20:16

Summary

Details

Severity

4.6 (Medium)


                    
                      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

6.8 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-58404	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-58404	REPORT
	https://github.com/gohugoio/hugo/security/advisor…	REPORT
	https://github.com/gohugoio/hugo/pull/15020	REPORT
	https://github.com/gohugoio/hugo/commit/a00b5c72a…	REPORT
	https://github.com/gohugoio/hugo/releases/tag/v0.163.1	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-spf13-hugo-dev",
            "binary_version": "0.15+git20160206.203.ed23711-1"
          },
          {
            "binary_name": "hugo",
            "binary_version": "0.15+git20160206.203.ed23711-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "hugo",
        "purl": "pkg:deb/ubuntu/hugo@0.15+git20160206.203.ed23711-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.15+git20160109.147.dd1d655-1",
        "0.15+git20160109.147.dd1d655-2",
        "0.15+git20160128.179.5def6d9-1",
        "0.15+git20160206.203.ed23711-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-gohugoio-hugo-dev",
            "binary_version": "0.40.1-1"
          },
          {
            "binary_name": "hugo",
            "binary_version": "0.40.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "hugo",
        "purl": "pkg:deb/ubuntu/hugo@0.40.1-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.25.1-2",
        "0.26-1",
        "0.35-1",
        "0.37.1-1",
        "0.38-1",
        "0.39-1",
        "0.40-1",
        "0.40.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hugo",
            "binary_version": "0.68.3-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "hugo",
        "purl": "pkg:deb/ubuntu/hugo@0.68.3-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.57.2-1",
        "0.58.3-1",
        "0.59.1-1.1",
        "0.68.3-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hugo",
            "binary_version": "0.92.2-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "hugo",
        "purl": "pkg:deb/ubuntu/hugo@0.92.2-1ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.80.0-6",
        "0.89.4-2",
        "0.90.0-1",
        "0.90.1-1",
        "0.91.0-1",
        "0.91.2-1",
        "0.92.0-1",
        "0.92.1-1build1",
        "0.92.2-1",
        "0.92.2-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hugo",
            "binary_version": "0.123.7-1ubuntu0.3+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "hugo",
        "purl": "pkg:deb/ubuntu/hugo@0.123.7-1ubuntu0.3+esm2?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.113.0-3",
        "0.119.0-2",
        "0.120.3-1",
        "0.120.4-1",
        "0.121.2-1",
        "0.122.0-1",
        "0.123.7-1build1",
        "0.123.7-1ubuntu0.1",
        "0.123.7-1ubuntu0.2",
        "0.123.7-1ubuntu0.2+esm1",
        "0.123.7-1ubuntu0.3",
        "0.123.7-1ubuntu0.3+esm1",
        "0.123.7-1ubuntu0.3+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hugo",
            "binary_version": "0.131.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "hugo",
        "purl": "pkg:deb/ubuntu/hugo@0.131.0-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.131.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "hugo",
            "binary_version": "0.154.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "hugo",
        "purl": "pkg:deb/ubuntu/hugo@0.154.5-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.131.0-1",
        "0.152.2-1",
        "0.153.1-3",
        "0.153.2-1",
        "0.154.2-2",
        "0.154.3-1",
        "0.154.5-1"
      ]
    }
  ],
  "aliases": [],
  "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": "UBUNTU-CVE-2026-58404",
  "modified": "2026-07-06T20:16:00Z",
  "published": "2026-07-06T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-58404"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-58404"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gohugoio/hugo/pull/15020"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gohugoio/hugo/releases/tag/v0.163.1"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "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"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-58404"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-58404 (GCVE-0-2026-58404)

FKIE_CVE-2026-58404

GHSA-R46F-3RPW-HXRV

Impact

RHSA-2026:36862

ubuntu-cve-2026-58404

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour