pnpm up to 12.0.0-alpha.4 pacquet path traversal

Summaryinfo

A vulnerability categorized as problematic has been discovered in pnpm up to 12.0.0-alpha.4. This impacts an unknown function of the component pacquet. Such manipulation leads to path traversal. This vulnerability is documented as CVE-2026-101044. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in pnpm up to 12.0.0-alpha.4 and classified as problematic. Affected by this issue is an unknown functionality of the component pacquet. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity, and availability. CVE summarizes:

pacquet, the Rust package-manager component shipped in the pnpm npm package versions >=12.0.0-alpha.0 and <12.0.0-alpha.5, does not validate dependency alias/name paths taken from a lockfile before using them in install-time filesystem joins. When a user installs a project with an attacker-supplied lockfile using --trust-lockfile or a frozen lockfile, alias entries containing path traversal segments (for example '../../escaped-link') are used when creating dependency and package links, bin destinations, hoisted entries, and virtual-store slots, allowing symlinks and directories to be created outside the intended project and node_modules boundary. Version 12.0.0-alpha.5 validates dependency names and every virtual-store slot path with a shared safe-join containment helper before any filesystem materialization, rejecting traversal, absolute, platform-specific, and reserved names with ERR_PNPM_INVALID_DEPENDENCY_NAME.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-101044 since 09/27/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 12.0.0-alpha.5 eliminates this vulnerability.

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Productinfo

Name

• pnpm

Version

• 12.0.0-alpha.0
• 12.0.0-alpha.1
• 12.0.0-alpha.2
• 12.0.0-alpha.3
• 12.0.0-alpha.4

Website

• Product: https://github.com/pnpm/pnpm/

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