CVE-2026-50021

pnpm: Integrity Check Bypass via Missing Lockfile Integrity Field

State: Published
Severity: 6.8 Medium
Published: Jun 25, 2026
Updated: Jun 26, 2026
Reserved: Jun 2, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	6.8 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-354 Improper Validation of Integrity Check Value

Affected Products

Product	Versions
pnpmpnpm	< 10.34.0Affected >= 11.0.0, < 11.4.0Affected

References

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

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