External Control of File Name or Path Affecting pnpm package, versions >=12.0.0-alpha.0 <12.0.0-alpha.5
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- published2 Sept 2026
- disclosed1 Sept 2026
- creditUnknown
Introduced: 1 Sep 2026
New CVE NOT AVAILABLE CWE-22 (opens in a new tab)How to fix?
Upgrade pnpm to version 12.0.0-alpha.5 or higher.
Overview
pnpm is a Fast, disk space efficient package manager
Affected versions of this package are vulnerable to External Control of File Name or Path and link following in its lockfile install path (safe_join_modules_dir.rs in the bundled pacquet package manager), whose containment checks fail to reject traversal, absolute, platform-specific, and reserved dependency names. An attacker can create symlinks and write files outside the project or node_modules boundary by distributing a lockfile whose dependency aliases contain traversal segments such as ../../escaped-link. This requires the victim to run an install with --trust-lockfile, or a trusted frozen lockfile, against the attacker-supplied lockfile.