Bug 2433095 (CVE-2026-23888)

Summary:	CVE-2026-23888 pnpm: pnpm: Arbitrary file write via path traversal in binary fetcher leading to remote code execution
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	asoldano, bbaranow, bmaxwell, brian.stansberry, darran.lofthouse, dosoudil, istudens, ivassile, iweiss, mosmerov, msvehla, nwallace, pberan, pesilva, pjindal, pmackay, rstancel, smaestri, tom.jenkinson
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in pnpm, a package manager. A path traversal vulnerability in pnpm's binary fetcher allows malicious packages to write files outside the intended extraction directory. This can occur through malicious ZIP entries containing directory traversal sequences (../) or absolute paths, or by a crafted BinaryResolution.prefix field. An attacker could exploit this to overwrite sensitive files, potentially leading to remote code execution (RCE).	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-01-26 22:02:15 UTC

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, CI/CD pipelines that auto-install binary dependencies, and those who can overwrite config files, scripts, or other sensitive files leading to RCE. Version 10.28.1 contains a patch.