Vulnerability-Lookup

CVE-2026-75926 (GCVE-0-2026-75926)

Vulnerability from cvelistv5 – Published: 2026-08-18 15:47 – Updated: 2026-08-18 19:05

Title

Hugo 0.162.0 to 0.164.x - Node Permission Model Bypass via Default TailwindCSS Child-Process Grant

Summary

Hugo 0.161.0 placed the Node asset pipelines behind the Node.js permission model so that code running through PostCSS, Babel, or TailwindCSS could not reach the file system outside the project directory. Hugo 0.162.0 added tailwindcss to the AllowChildProcess default in config/security/securityConfig.go, which makes nodePermissionArgs in common/hexec/exec.go append --allow-child-process whenever the tool being launched is named tailwindcss. TailwindCSS loads the site's tailwind.config.js through require at startup, so top-level code in that file executes inside the permitted Node process and can call child_process to spawn a shell. The spawned process is not a Node process and inherits none of the permission flags, so it runs with the full privileges of the account performing the build. Building a site whose theme, module, or starter template supplies the Tailwind configuration therefore yields arbitrary command execution rather than the confined file access the permission model was introduced to enforce. Hugo 0.165.0 removes tailwindcss from the default security.exec.allow list, so the tool is no longer launched under the default configuration.

Severity

9.3 (Critical)


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

8.6 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 19:04 UTC

CWE

CWE-1188 - Initialization of a Resource with an Insecure Default

Assigner

VulnCheck mitre root

References

6 references

URL	Tags
https://github.com/gohugoio/hugo/commit/8a55df7af…	patch
https://github.com/gohugoio/hugo/issues/15178	issue-tracking
https://github.com/gohugoio/hugo/blob/v0.164.0/co…	technical-description
https://github.com/gohugoio/hugo/blob/v0.164.0/co…	technical-description
https://github.com/gohugoio/hugo	product
https://www.vulncheck.com/advisories/hugo-to-x-no…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
gohugoio	hugo	Affected: 0.162.0 , < 0.165.0 (semver) cpe:2.3:a:gohugo:hugo::::::::

Date Public

2026-08-09 00:00

Credits

Michael Holmquist

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-75926

Vulnerability from fkie_nvd - Published: 2026-08-18 16:18 - Updated: 2026-08-18 20:17

Severity

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

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/gohugoio/hugo
	disclosure@vulncheck.com	https://github.com/gohugoio/hugo/blob/v0.164.0/common/hexec/exec.go#L292-L295
	disclosure@vulncheck.com	https://github.com/gohugoio/hugo/blob/v0.164.0/config/security/securityConfig.go#L72-L79
	disclosure@vulncheck.com	https://github.com/gohugoio/hugo/commit/8a55df7af2e6da31297245cc54fa2e3b521d93e8
	disclosure@vulncheck.com	https://github.com/gohugoio/hugo/issues/15178
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/hugo-to-x-node-permission-model-bypass-via-default-tailwindcss-child-process-grant

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "lastModified": "2026-08-18T20:17:33.947",
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          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 6.0,
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-75926",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-18T19:04:55.035931Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-18T16:18:24.443",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/gohugoio/hugo"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/gohugoio/hugo/blob/v0.164.0/common/hexec/exec.go#L292-L295"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/gohugoio/hugo/blob/v0.164.0/config/security/securityConfig.go#L72-L79"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/gohugoio/hugo/commit/8a55df7af2e6da31297245cc54fa2e3b521d93e8"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/gohugoio/hugo/issues/15178"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/hugo-to-x-node-permission-model-bypass-via-default-tailwindcss-child-process-grant"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1188"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-PXPG-7GFV-6WC9

Vulnerability from github – Published: 2026-08-18 18:32 – Updated: 2026-08-18 18:32

Details

Severity

8.6 (High)


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

9.3 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-75926"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1188"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-18T16:18:24Z",
    "severity": "CRITICAL"
  },
  "details": "Hugo 0.161.0 placed the Node asset pipelines behind the Node.js permission model so that code running through PostCSS, Babel, or TailwindCSS could not reach the file system outside the project directory. Hugo 0.162.0 added tailwindcss to the AllowChildProcess default in config/security/securityConfig.go, which makes nodePermissionArgs in common/hexec/exec.go append --allow-child-process whenever the tool being launched is named tailwindcss. TailwindCSS loads the site\u0027s tailwind.config.js through require at startup, so top-level code in that file executes inside the permitted Node process and can call child_process to spawn a shell. The spawned process is not a Node process and inherits none of the permission flags, so it runs with the full privileges of the account performing the build. Building a site whose theme, module, or starter template supplies the Tailwind configuration therefore yields arbitrary command execution rather than the confined file access the permission model was introduced to enforce. Hugo 0.165.0 removes tailwindcss from the default security.exec.allow list, so the tool is no longer launched under the default configuration.",
  "id": "GHSA-pxpg-7gfv-6wc9",
  "modified": "2026-08-18T18:32:00Z",
  "published": "2026-08-18T18:32:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75926"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gohugoio/hugo/issues/15178"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gohugoio/hugo/commit/8a55df7af2e6da31297245cc54fa2e3b521d93e8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gohugoio/hugo"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gohugoio/hugo/blob/v0.164.0/common/hexec/exec.go#L292-L295"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gohugoio/hugo/blob/v0.164.0/config/security/securityConfig.go#L72-L79"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/hugo-to-x-node-permission-model-bypass-via-default-tailwindcss-child-process-grant"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

ubuntu-cve-2026-75926

Vulnerability from osv_ubuntu

Published

2026-08-19 00:00

Modified

2026-08-19 00:00

Summary

Details

(Hugo 0.161.0 placed the Node asset pipelines behind the Node.js permis ...)

Severity

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-75926	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-75926	REPORT
	https://github.com/gohugoio/hugo/issues/15178	REPORT
	https://github.com/gohugoio/hugo/issues/15171	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": "0.154.5-1"
          }
        ]
      },
      "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 0.161.0 placed the Node asset pipelines behind the Node.js permis ...)",
  "id": "UBUNTU-CVE-2026-75926",
  "modified": "2026-08-19T00:00:00Z",
  "published": "2026-08-19T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-75926"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-75926"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gohugoio/hugo/issues/15178"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/gohugoio/hugo/issues/15171"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-75926"
  ]
}

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.

Action not permitted

CVE-2026-75926 (GCVE-0-2026-75926)

FKIE_CVE-2026-75926

GHSA-PXPG-7GFV-6WC9

ubuntu-cve-2026-75926

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature