BREW-PNPM-CVE-2026-23888 (GHSA-6PFH-P556-V868)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:28 – Updated: 2026-09-20 11:59 – Source websitepnpm 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.
{
"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": "0"
},
{
"fixed": "11.21.0"
}
],
"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": "v12.5.1"
},
{
"ecosystem": "npm",
"key": "pkg:npm/pnpm@12.5.1",
"name": "pnpm",
"strategy": "registry",
"subject_version": "12.5.1"
}
]
},
"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": "2026-09-20T11:59:11Z",
"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": [
"GHSA-6pfh-p556-v868",
"CVE-2026-23888"
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
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