CVE-2026-24131
MEDIUM
GHSA-v253-rj99-jwpq
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
4Description
pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `"directories": {"bin": "../../../../tmp"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch.
Analysis
pnpm versions before 10.28.2 fail to validate the `directories.bin` field during package processing, allowing malicious packages to use path traversal (e.g., `../../../../tmp`) to escape the package root and chmod 755 files at arbitrary locations on Unix-like systems. Public exploit code exists for this vulnerability. …
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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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External POC / Exploit Code
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