Vulnerability-Lookup

GHSA-VV9J-GJW2-J8WP

Vulnerability from github – Published: 2026-05-26 23:10 – Updated: 2026-07-08 17:36

Summary

yeoman-environment Vulnerable to Arbitrary Package Installation without User Confirmation

Details

Impact

yeoman-environment versions >= 2.9.0 and < 6.0.1 install missing local generator packages from caller-supplied package names without user confirmation. In downstream consumers that pass attacker-controlled project configuration into this path, this can result in arbitrary package installation and code execution during CLI bootstrap.

The vulnerable method is installLocalGenerators(), which calls repository.install() directly without prompting the user.

Patches

Upgrade to yeoman-environment 6.0.1, which adds an interactive confirmation prompt before installation (PR #753).

Workarounds

None.

Resources

Fix commit 78d2af7

Severity

8.6 (High)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "yeoman-environment"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.9.0"
            },
            {
              "fixed": "6.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42089"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-829"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-26T23:10:38Z",
    "nvd_published_at": "2026-06-16T17:16:40Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\n`yeoman-environment` versions `\u003e= 2.9.0` and `\u003c 6.0.1` install missing local generator packages from caller-supplied package names without user confirmation. In downstream consumers that pass attacker-controlled project configuration into this path, this can result in arbitrary package installation and code execution during CLI bootstrap.\n\nThe vulnerable method is `installLocalGenerators()`, which calls `repository.install()` directly without prompting the user.\n\n### Patches\n\nUpgrade to `yeoman-environment` `6.0.1`, which adds an interactive confirmation prompt before installation ([PR #753](https://github.com/yeoman/environment/pull/753)).\n\n### Workarounds\n\nNone.\n\n### Resources\n\n- [Fix commit 78d2af7](https://github.com/yeoman/environment/commit/78d2af7e60294784b8a8b3b3b5099c6874b6a1fa)",
  "id": "GHSA-vv9j-gjw2-j8wp",
  "modified": "2026-07-08T17:36:49Z",
  "published": "2026-05-26T23:10:38Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/yeoman/environment/security/advisories/GHSA-vv9j-gjw2-j8wp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42089"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yeoman/environment/pull/753"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yeoman/environment/commit/78d2af7e60294784b8a8b3b3b5099c6874b6a1fa"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/yeoman/environment"
    }
  ],
  "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"
    }
  ],
  "summary": "yeoman-environment Vulnerable to Arbitrary Package Installation without User Confirmation"
}

CVE-2026-42089 (GCVE-0-2026-42089)

Vulnerability from cvelistv5 – Published: 2026-06-16 16:15 – Updated: 2026-06-16 17:24

Title

yeoman-environment Vulnerable to Arbitrary Package Installation without User Confirmation

Summary

Yeoman Environment provides an API to discover, create, and run generators, and to configure where and how a generator is resolved. Versions 2.9.0 through 6.0.0 install missing local generator packages from caller-supplied package names without user confirmation. In downstream consumers that pass attacker-controlled project configuration into this path, this can result in arbitrary package installation and code execution during CLI bootstrap. The vulnerable method is installLocalGenerators(), which calls repository.install() directly without prompting the user. This issue has been fixed in version 6.0.0.

Severity

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 2026-06-16 17:23 UTC

CWE

CWE-829 - Inclusion of Functionality from Untrusted Control Sphere

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/yeoman/environment/security/ad…	x_refsource_CONFIRM
https://github.com/yeoman/environment/pull/753	x_refsource_MISC
https://github.com/yeoman/environment/commit/78d2…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
yeoman	environment	Affected: >= 2.9.0, < 6.0.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42089",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-16T17:23:58.864894Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-16T17:24:07.061Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "environment",
          "vendor": "yeoman",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.9.0, \u003c 6.0.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Yeoman Environment provides an API to discover, create, and run generators, and to configure where and how a generator is resolved. Versions 2.9.0 through 6.0.0 install missing local generator packages from caller-supplied package names without user confirmation. In downstream consumers that pass attacker-controlled project configuration into this path, this can result in arbitrary package installation and code execution during CLI bootstrap. The vulnerable method is installLocalGenerators(), which calls repository.install() directly without prompting the user. This issue has been fixed in version 6.0.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-829",
              "description": "CWE-829: Inclusion of Functionality from Untrusted Control Sphere",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-16T16:15:04.499Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/yeoman/environment/security/advisories/GHSA-vv9j-gjw2-j8wp",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/yeoman/environment/security/advisories/GHSA-vv9j-gjw2-j8wp"
        },
        {
          "name": "https://github.com/yeoman/environment/pull/753",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/yeoman/environment/pull/753"
        },
        {
          "name": "https://github.com/yeoman/environment/commit/78d2af7e60294784b8a8b3b3b5099c6874b6a1fa",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/yeoman/environment/commit/78d2af7e60294784b8a8b3b3b5099c6874b6a1fa"
        }
      ],
      "source": {
        "advisory": "GHSA-vv9j-gjw2-j8wp",
        "discovery": "UNKNOWN"
      },
      "title": "yeoman-environment Vulnerable to Arbitrary Package Installation without User Confirmation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42089",
    "datePublished": "2026-06-16T16:15:04.499Z",
    "dateReserved": "2026-04-23T19:17:30.566Z",
    "dateUpdated": "2026-06-16T17:24:07.061Z",
    "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

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