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

Vulnerability from cvelistv5 – Published: 2026-07-06 19:52 – Updated: 2026-07-06 19:52
VLAI
Title
Hugo: Symlink confinement bypass in resources.Get
Summary
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
CWE
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
Impacted products
Vendor Product Version
gohugoio hugo Affected: >= 0.123.0, < 0.162.0
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          "vendor": "gohugoio",
          "versions": [
            {
              "status": "affected",
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            }
          ]
        }
      ],
      "descriptions": [
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          "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": [
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          "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": [
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          ],
          "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": "2026-07-06T19:52:04.561Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-06-14",
      "epss": "0.00024",
      "percentile": "0.07225"
    },
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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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.
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  • 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.