Vulnerability · Published Sep 27, 2026 · Assigned by VulnCheck

CVE-2026-101044pacquet before 12.0.0-alpha.5 Path Traversal via lockfile alias

High 7.1

In plain English

A high-severity path traversal in pnpm from pnpm. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.3%top 82.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
pnpm	pnpm	12.0.0-alpha.0 – before 12.0.0-alpha.5

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

References

GitHub Security Advisory (GHSA-2rx9-3g3h-c2jv) vendor-advisory
VulnCheck Advisory: pacquet before 12.0.0-alpha.5 Path Traversal via lockfile alias third-party-advisory