CVE-2026-23889
MEDIUM
GHSA-6x96-7vc8-cm3p
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Lifecycle Timeline
4Description
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.
Analysis
Path traversal in pnpm's tarball extraction on Windows allows attackers to write files outside the intended package directory by exploiting incomplete path normalization that fails to block backslash-based traversal sequences. Public exploit code exists for this vulnerability, which affects Windows developers and CI/CD pipelines (GitHub Actions, Azure DevOps) and could result in overwriting sensitive configuration files like .npmrc or build configurations. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review file handling controls.
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