CVE-2026-55697: pnpm: Repository-controlled configDependencies can select a pacquet native install engine

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-06-25 · updated 2026-06-30
Weakness: CWE-78

Description

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, pnpm can install configDependencies declared in pnpm-workspace.yaml before command dispatch. Before the patch, a repository could declare pacquet or @pnpm/pacquet as a config dependency and pnpm treated that repository-controlled dependency as an install-engine opt-in. During install, pnpm resolved a platform-specific @pacquet/<platform>-<arch>/pacquet binary from node_modules/.pnpm-config/<packageName> and spawned it as the developer or CI user. This vulnerability is fixed in 10.34.2 and 11.5.3.

Affected products

pnpm: before 10.34.2; from 11.0.0 before 11.5.3 — fixed in 10.34.2, 11.5.3

How to fix

Upgrade to a fixed version: pnpm 10.34.2, 11.5.3. Check the vendor advisory for mitigations.

References

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