Vulnerability-Lookup

CVE-2026-23890 (GCVE-0-2026-23890)

Vulnerability from cvelistv5 – Published: 2026-01-26 21:53 – Updated: 2026-01-27 21:39

Title

pnpm scoped bin name Path Traversal allows arbitrary file creation outside node_modules/.bin

Summary

pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm's bin linking allows malicious npm packages to create executable shims or symlinks outside of `node_modules/.bin`. Bin names starting with `@` bypass validation, and after scope normalization, path traversal sequences like `../../` remain intact. This issue affects all pnpm users who install npm packages and CI/CD pipelines using pnpm. It can lead to overwriting config files, scripts, or other sensitive files. Version 10.28.1 contains a patch.

Severity ?

6.5 (Medium)


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

CWE

CWE-23 - Relative Path Traversal

Assigner

GitHub_M

References

URL

Tags

	https://github.com/pnpm/pnpm/security/advisories/…	x_refsource_CONFIRM
	https://github.com/pnpm/pnpm/commit/8afbb1598445d…	x_refsource_MISC
	https://github.com/pnpm/pnpm/releases/tag/v10.28.1	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	pnpm	pnpm	Affected: < 10.28.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-23890",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-27T21:39:49.236417Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-27T21:39:57.954Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pnpm",
          "vendor": "pnpm",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 10.28.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm\u0027s bin linking allows malicious npm packages to create executable shims or symlinks outside of `node_modules/.bin`. Bin names starting with `@` bypass validation, and after scope normalization, path traversal sequences like `../../` remain intact. This issue affects all pnpm users who install npm packages and CI/CD pipelines using pnpm. It can lead to overwriting config files, scripts, or other sensitive files. Version 10.28.1 contains a patch."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-23",
              "description": "CWE-23: Relative Path Traversal",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-01-26T22:00:34.275Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pnpm/pnpm/security/advisories/GHSA-xpqm-wm3m-f34h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pnpm/pnpm/security/advisories/GHSA-xpqm-wm3m-f34h"
        },
        {
          "name": "https://github.com/pnpm/pnpm/commit/8afbb1598445d37985d91fda18abb4795ae5062d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnpm/pnpm/commit/8afbb1598445d37985d91fda18abb4795ae5062d"
        },
        {
          "name": "https://github.com/pnpm/pnpm/releases/tag/v10.28.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pnpm/pnpm/releases/tag/v10.28.1"
        }
      ],
      "source": {
        "advisory": "GHSA-xpqm-wm3m-f34h",
        "discovery": "UNKNOWN"
      },
      "title": "pnpm scoped bin name Path Traversal allows arbitrary file creation outside node_modules/.bin"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-23890",
    "datePublished": "2026-01-26T21:53:40.810Z",
    "dateReserved": "2026-01-16T21:02:02.902Z",
    "dateUpdated": "2026-01-27T21:39:57.954Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23890\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-01-26T22:15:56.363\",\"lastModified\":\"2026-01-27T14:59:34.073\",\"vulnStatus\":\"Undergoing Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm\u0027s bin linking allows malicious npm packages to create executable shims or symlinks outside of `node_modules/.bin`. Bin names starting with `@` bypass validation, and after scope normalization, path traversal sequences like `../../` remain intact. This issue affects all pnpm users who install npm packages and CI/CD pipelines using pnpm. It can lead to overwriting config files, scripts, or other sensitive files. Version 10.28.1 contains a patch.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-23\"}]}],\"references\":[{\"url\":\"https://github.com/pnpm/pnpm/commit/8afbb1598445d37985d91fda18abb4795ae5062d\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/pnpm/pnpm/releases/tag/v10.28.1\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/pnpm/pnpm/security/advisories/GHSA-xpqm-wm3m-f34h\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

GHSA-XPQM-WM3M-F34H

Vulnerability from github – Published: 2026-01-26 21:02 – Updated: 2026-01-26 21:02

Summary

pnpm scoped bin name Path Traversal allows arbitrary file creation outside node_modules/.bin

Details

Summary

A path traversal vulnerability in pnpm's bin linking allows malicious npm packages to create executable shims or symlinks outside of node_modules/.bin. Bin names starting with @ bypass validation, and after scope normalization, path traversal sequences like ../../ remain intact.

Details

The vulnerability exists in the bin name validation and normalization logic:

1. Validation Bypass (pkg-manager/package-bins/src/index.ts)

The filter allows any bin name starting with @ to pass through without validation:

.filter((commandName) =>
  encodeURIComponent(commandName) === commandName ||
  commandName === '' ||
  commandName[0] === '@'  // <-- Bypasses validation
)

2. Incomplete Normalization (pkg-manager/package-bins/src/index.ts)

function normalizeBinName (name: string): string {
  return name[0] === '@' ? name.slice(name.indexOf('/') + 1) : name
}
// Input:  @scope/../../evil
// Output: ../../evil  <-- Path traversal preserved!

3. Exploitation (pkg-manager/link-bins/src/index.ts:288)

The normalized name is used directly in path.join() without validation.

PoC

Create a malicious package:

{
  "name": "malicious-pkg",
  "version": "1.0.0",
  "bin": {
    "@scope/../../.npmrc": "./malicious.js"
  }
}

Install the package:

pnpm add /path/to/malicious-pkg

Observe .npmrc created in project root (outside node_modules/.bin).

Impact

All pnpm users who install npm packages
CI/CD pipelines using pnpm
Can overwrite config files, scripts, or other sensitive files

Verified on pnpm main @ commit 5a0ed1d45.

Severity ?

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "pnpm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "10.28.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-23890"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-23"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-26T21:02:39Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nA path traversal vulnerability in pnpm\u0027s bin linking allows malicious npm packages to create executable shims or symlinks outside of `node_modules/.bin`. Bin names starting with `@` bypass validation, and after scope normalization, path traversal sequences like `../../` remain intact.\n\n### Details\nThe vulnerability exists in the bin name validation and normalization logic:\n\n**1. Validation Bypass (`pkg-manager/package-bins/src/index.ts`)**\n\nThe filter allows any bin name starting with `@` to pass through without validation:\n\n```typescript\n.filter((commandName) =\u003e\n  encodeURIComponent(commandName) === commandName ||\n  commandName === \u0027\u0027 ||\n  commandName[0] === \u0027@\u0027  // \u003c-- Bypasses validation\n)\n```\n\n**2. Incomplete Normalization (`pkg-manager/package-bins/src/index.ts`)**\n\n```typescript\nfunction normalizeBinName (name: string): string {\n  return name[0] === \u0027@\u0027 ? name.slice(name.indexOf(\u0027/\u0027) + 1) : name\n}\n// Input:  @scope/../../evil\n// Output: ../../evil  \u003c-- Path traversal preserved!\n```\n\n**3. Exploitation (`pkg-manager/link-bins/src/index.ts:288`)**\n\nThe normalized name is used directly in `path.join()` without validation.\n\n### PoC\n1. Create a malicious package:\n```json\n{\n  \"name\": \"malicious-pkg\",\n  \"version\": \"1.0.0\",\n  \"bin\": {\n    \"@scope/../../.npmrc\": \"./malicious.js\"\n  }\n}\n```\n\n2. Install the package:\n```bash\npnpm add /path/to/malicious-pkg\n```\n\n3. Observe `.npmrc` created in project root (outside node_modules/.bin).\n\n### Impact\n- All pnpm users who install npm packages\n- CI/CD pipelines using pnpm\n- Can overwrite config files, scripts, or other sensitive files\n\nVerified on pnpm main @ commit 5a0ed1d45.",
  "id": "GHSA-xpqm-wm3m-f34h",
  "modified": "2026-01-26T21:02:39Z",
  "published": "2026-01-26T21:02:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/security/advisories/GHSA-xpqm-wm3m-f34h"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/commit/8afbb1598445d37985d91fda18abb4795ae5062d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pnpm/pnpm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/releases/tag/v10.28.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pnpm scoped bin name Path Traversal allows arbitrary file creation outside node_modules/.bin"
}

FKIE_CVE-2026-23890

Vulnerability from fkie_nvd - Published: 2026-01-26 22:15 - Updated: 2026-01-27 14:59

Severity ?

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/pnpm/pnpm/commit/8afbb1598445d37985d91fda18abb4795ae5062d
	security-advisories@github.com	https://github.com/pnpm/pnpm/releases/tag/v10.28.1
	security-advisories@github.com	https://github.com/pnpm/pnpm/security/advisories/GHSA-xpqm-wm3m-f34h

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm\u0027s bin linking allows malicious npm packages to create executable shims or symlinks outside of `node_modules/.bin`. Bin names starting with `@` bypass validation, and after scope normalization, path traversal sequences like `../../` remain intact. This issue affects all pnpm users who install npm packages and CI/CD pipelines using pnpm. It can lead to overwriting config files, scripts, or other sensitive files. Version 10.28.1 contains a patch."
    }
  ],
  "id": "CVE-2026-23890",
  "lastModified": "2026-01-27T14:59:34.073",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-26T22:15:56.363",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pnpm/pnpm/commit/8afbb1598445d37985d91fda18abb4795ae5062d"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pnpm/pnpm/releases/tag/v10.28.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pnpm/pnpm/security/advisories/GHSA-xpqm-wm3m-f34h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-23"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2026-23890 (GCVE-0-2026-23890)

GHSA-XPQM-WM3M-F34H

Summary

Details

PoC

Impact

FKIE_CVE-2026-23890

Tags

Sightings

Nomenclature