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    CVE-2026-23889

    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.

    Published:Jan 26, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 26, 2026
    EPSS Score:0.00017
    CVSS Score:6.5

    Affected Products

    Vendor
    Microsoft
    Product
    Windows
    Vendor
    Pnpm
    Product
    Pnpm

    Exploits

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

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High