Vulnerability-Lookup

ubuntu-cve-2026-50135

Vulnerability from osv_ubuntu

Published

2026-07-06 21:16

Modified

2026-07-09 19:36

Summary

Details

Hugo is a static site generator. From 0.123.0 to 0.161.1, a regression made RootMappingFs.statRoot use Stat (follows symlinks) instead of Lstat , so a direct resources.Get of a symlink pointing outside its mount returned the target's contents — letting a symlink planted in a local mount (e.g. a vendored themes/ theme) read arbitrary files accessible to the Hugo user. Go-module themes from GitHub (symlinks stripped) and directory walks were unaffected. Fixed in 0.162.0.

Severity

6.9 (Medium)


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

5.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-50135	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-50135	REPORT
	https://github.com/gohugoio/hugo/security/advisor…	REPORT
	https://github.com/gohugoio/hugo/commit/f8b5fa09a…	REPORT
	https://github.com/gohugoio/hugo/releases/tag/v0.162.0	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 0.123.0 to 0.161.1, a regression made \u00a0RootMappingFs.statRoot\u00a0 use \u00a0Stat\u00a0 (follows symlinks) instead of \u00a0Lstat\u00a0, so a direct \u00a0resources.Get\u00a0 of a symlink pointing outside its mount returned the target\u0027s contents \u2014 letting a symlink planted in a local mount (e.g. a vendored \u00a0themes/\u00a0 theme) read arbitrary files accessible to the Hugo user. Go-module themes from GitHub (symlinks stripped) and directory walks were unaffected. Fixed in 0.162.0.",
  "id": "UBUNTU-CVE-2026-50135",
  "modified": "2026-07-09T19:36:23Z",
  "published": "2026-07-06T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-50135"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-50135"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gohugoio/hugo/security/advisories/GHSA-fw87-fv5r-9fpw"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gohugoio/hugo/commit/f8b5fa09a64950c32b803821ede411ebfe772b7a"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gohugoio/hugo/releases/tag/v0.162.0"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-50135"
  ]
}

CVE-2026-50135 (GCVE-0-2026-50135)

Vulnerability from cvelistv5 – Published: 2026-07-06 19:52 – Updated: 2026-07-07 16:57

Title

Hugo: Symlink confinement bypass in resources.Get

Summary

Severity

6.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-07 16:52 UTC

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/gohugoio/hugo/security/advisor…	x_refsource_CONFIRM
https://github.com/gohugoio/hugo/commit/f8b5fa09a…	x_refsource_MISC
https://github.com/gohugoio/hugo/releases/tag/v0.162.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
gohugoio	hugo	Affected: >= 0.123.0, < 0.162.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-50135",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-07T16:52:31.351209Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-07T16:57:29.874Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "hugo",
          "vendor": "gohugoio",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.123.0, \u003c 0.162.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Hugo is a static site generator. From 0.123.0 to 0.161.1, a regression made \u00a0RootMappingFs.statRoot\u00a0 use \u00a0Stat\u00a0 (follows symlinks) instead of \u00a0Lstat\u00a0, so a direct \u00a0resources.Get\u00a0 of a symlink pointing outside its mount returned the target\u0027s contents \u2014 letting a symlink planted in a local mount (e.g. a vendored \u00a0themes/\u00a0 theme) read arbitrary files accessible to the Hugo user. Go-module themes from GitHub (symlinks stripped) and directory walks were unaffected. Fixed in 0.162.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-06T19:52:04.561Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/gohugoio/hugo/security/advisories/GHSA-fw87-fv5r-9fpw",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/gohugoio/hugo/security/advisories/GHSA-fw87-fv5r-9fpw"
        },
        {
          "name": "https://github.com/gohugoio/hugo/commit/f8b5fa09a64950c32b803821ede411ebfe772b7a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gohugoio/hugo/commit/f8b5fa09a64950c32b803821ede411ebfe772b7a"
        },
        {
          "name": "https://github.com/gohugoio/hugo/releases/tag/v0.162.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gohugoio/hugo/releases/tag/v0.162.0"
        }
      ],
      "source": {
        "advisory": "GHSA-fw87-fv5r-9fpw",
        "discovery": "UNKNOWN"
      },
      "title": "Hugo: Symlink confinement bypass in resources.Get"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-50135",
    "datePublished": "2026-07-06T19:52:04.561Z",
    "dateReserved": "2026-06-03T18:49:32.275Z",
    "dateUpdated": "2026-07-07T16:57:29.874Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.