CVE-2026-23889

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm's tarball extraction allows malicious packages to write files outside the package directory on Windows. The path normalization only checks for `./` but not `.\`. On Windows, backslashes are directory separators, enabling path traversal. This vulnerability is Windows-only. This issue impacts Windows pnpm users and Windows CI/CD pipelines (GitHub Actions Windows runners, Azure DevOps). It can lead to overwriting `.npmrc`, build configs, or other files. Version 10.28.1 contains a patch.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-22

Affected software

Vendor	Product	Versions
pnpm	pnpm	< 10.28.1

References

https://github.com/pnpm/pnpm/commit/6ca07ffbe6fc0e8b8cdc968f228903ba0886f7c0Patch
https://github.com/pnpm/pnpm/releases/tag/v10.28.1Patch
https://github.com/pnpm/pnpm/security/advisories/GHSA-6x96-7vc8-cm3pExploit, Vendor Advisory

Timeline

Published: Jan 26, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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