CVE-2026-23889

Published: Jan 26, 2026Modified: Jan 28, 2026

6.5

Vector

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

Exploitability: 2.8 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

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.

Affected (1)

Products: Pnpm: Pnpm

1 product

Configuration A

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Pnpm Pnpm	Before 10.28.1

Running on/with	Platform Versions
Microsoft Windows	All versions

Related CWEs

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References (3)

https://github.com/pnpm/pnpm/commit/6ca07ffbe6fc0e8b8cdc968f228903ba0886f7c0

Source: security-advisories@github.com

Patch

https://github.com/pnpm/pnpm/releases/tag/v10.28.1

Source: security-advisories@github.com

Patch

https://github.com/pnpm/pnpm/security/advisories/GHSA-6x96-7vc8-cm3p

Source: security-advisories@github.com

ExploitVendor Advisory

Timeline

No history available yet.