Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pnpm | Pnpm | < 10.28.1 |
| Microsoft | Windows | - |
Related Weaknesses (CWE)
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-cm3pExploitVendor Advisory
FAQ
What is CVE-2026-23889?
CVE-2026-23889 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 ...
How severe is CVE-2026-23889?
CVE-2026-23889 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23889?
Check the references section above for vendor advisories and patch information. Affected products include: Pnpm Pnpm, Microsoft Windows.