CVE-2026-23889

MEDIUM

6.5

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published1/26/2026

Last Modified1/28/2026

Sourcenvd

Honeypot Sightings0

Affected Products

microsoft:windowspnpm:pnpm

Weaknesses (CWE)

CWE-22

References

https://github.com/pnpm/pnpm/commit/6ca07ffbe6fc0e8b8cdc968f228903ba0886f7c0(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-6x96-7vc8-cm3p(security-advisories@github.com)

IOC Correlations

No correlations recorded

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