CVE-2026-55698: Pnpm

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, pnpm can persist package-manager bootstrap metadata in the first YAML document of pnpm-lock.yaml. Before the patch, direct pnpm execution trusted an already resolved packageManagerDependencies entry when the committed env lockfile contained matching pnpm and @pnpm/exe versions. A malicious repository could therefore commit package-manager lockfile package records and snapshots that bypassed fresh package-manager resolution, then cause pnpm to install and execute bytes selected by that committed lockfile state during automatic version switching. This vulnerability is fixed in 10.34.2 and 11.5.3.

Affected products

• Pnpm Pnpm: before 10.34.2 (fixed in 10.34.2); from 11.0.0, before 11.5.3 (fixed in 11.5.3)

Published 2026-06-25. Last modified 2026-06-30.