CVE-2026-50021

pnpm: Integrity Check Bypass via Missing Lockfile Integrity Field

Published: Jun 25, 2026Updated: Jun 29, 2026 Sources: CVE List NVDCWE-354

6.8MEDIUM

Description

pnpm is a package manager. Prior to 10.34.0 and 11.4.0, pnpm's tarball extraction worker skips integrity verification when the integrity field is absent from the lockfile resolution. If an attacker can both modify pnpm-lock.yaml to remove the integrity: field and cause the referenced registry URL to serve altered package content, pnpm install --frozen-lockfile can install the altered package without an integrity error. npm's npm ci enforces integrity by default; pnpm's behavior of silently skipping verification is a pnpm-specific fail-open gap. This vulnerability is fixed in 10.34.0 and 11.4.0.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-354

Affected Products

pnpm

oss-project

pnpmLibrary

OSS Libraries / npm

Exploitability

Workaround Available

References

https://github.com/pnpm/pnpm/security/advisories/GHSA-q6j5-fjx5-2mc3

github.com

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