Medium severity6.5OSV Advisory· Published Jan 26, 2026· Updated Jun 17, 2026
CVE-2026-23889
CVE-2026-23889
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pnpmnpm | < 10.28.1 | 10.28.1 |
Affected products
30.19.0, @pnpm/[email protected], @pnpm/[email protected], …+ 1 more
- (no CPE)range: 0.19.0, @pnpm/[email protected], @pnpm/[email protected], …
- cpe:2.3:a:pnpm:pnpm:*:*:*:*:*:node.js:*:*range: <10.28.1
Patches
Vulnerability mechanics
References
5- github.com/pnpm/pnpm/commit/6ca07ffbe6fc0e8b8cdc968f228903ba0886f7c0nvdPatchWEB
- github.com/pnpm/pnpm/releases/tag/v10.28.1nvdPatchWEB
- github.com/pnpm/pnpm/security/advisories/GHSA-6x96-7vc8-cm3pnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-6x96-7vc8-cm3pghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-23889ghsaADVISORY
News mentions
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