BREW-PNPM-CVE-2026-23888 (CVE-2026-23888)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:28 – Updated: 2026-10-13 09:49 – Source website
VLAI
Summary
pnpm: Binary ZIP extraction allows arbitrary file write via path traversal (Zip Slip)
Details

pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm's binary fetcher allows malicious packages to write files outside the intended extraction directory. The vulnerability has two attack vectors: (1) Malicious ZIP entries containing ../ or absolute paths that escape the extraction root via AdmZip's extractAllTo, and (2) The BinaryResolution.prefix field is concatenated into the extraction path without validation, allowing a crafted prefix like ../../evil to redirect extracted files outside targetDir. The issue impacts all pnpm users who install packages with binary assets, users who configure custom Node.js binary locations and CI/CD pipelines that auto-install binary dependencies. It can lead to overwriting config files, scripts, or other sensitive files leading to RCE. 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
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "10.28.1"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "pnpm",
        "purl": "pkg:brew/pnpm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.2"
            },
            {
              "fixed": "10.28.1"
            }
          ],
          "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": "v12.11.2"
      },
      {
        "ecosystem": "npm",
        "key": "pkg:npm/pnpm@12.11.2",
        "name": "pnpm",
        "strategy": "registry",
        "subject_version": "12.11.2"
      }
    ]
  },
  "details": "pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm\u0027s binary fetcher allows malicious packages to write files outside the intended extraction directory. The vulnerability has two attack vectors: (1) Malicious ZIP entries containing `../` or absolute paths that escape the extraction root via AdmZip\u0027s `extractAllTo`, and (2) The `BinaryResolution.prefix` field is concatenated into the extraction path without validation, allowing a crafted prefix like `../../evil` to redirect extracted files outside `targetDir`. The issue impacts all pnpm users who install packages with binary assets, users who configure custom Node.js binary locations and CI/CD pipelines that auto-install binary dependencies. It can lead to overwriting config files, scripts, or other sensitive files leading to RCE. Version 10.28.1 contains a patch.",
  "id": "BREW-pnpm-CVE-2026-23888",
  "modified": "2026-10-13T09:49:45Z",
  "published": "2026-08-13T17:28:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/releases/tag/v10.28.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23888.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/pnpm/pnpm/security/advisories/GHSA-6pfh-p556-v868"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23888"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pnpm/pnpm/commit/5c382f0ca3b7cc49963b94677426e66539dcb3f5"
    }
  ],
  "schema_version": "1.7.3",
  "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: Binary ZIP extraction allows arbitrary file write via path traversal (Zip Slip)",
  "upstream": [
    "CVE-2026-23888",
    "GHSA-6pfh-p556-v868"
  ]
}



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