What’s Vulnerable › Vulnerabilities

CVE-2026-23889: pnpm has Windows-specific tarball Path Traversal

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-26 · updated 2026-06-17
• Weakness: CWE-22

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 products

• pnpm: before 10.28.1 — fixed in 10.28.1

How to fix

Upgrade to a fixed version: pnpm 10.28.1. Check the vendor advisory for mitigations.

References

• https://github.com/pnpm/pnpm/commit/6ca07ffbe6fc0e8b8cdc968f228903ba0886f7c0
• https://github.com/pnpm/pnpm/releases/tag/v10.28.1
• https://github.com/pnpm/pnpm/security/advisories/GHSA-6x96-7vc8-cm3p

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