CVE-2026-50021 pnpm: Integrity Check Bypass via Missing Lockfile Integrity Field
Attackers can bypass integrity checks in pnpm by removing lockfile fields, allowing installation of malicious packages during frozen installs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50021?
CVE-2026-50021 is a medium-severity vulnerability in pnpm, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-354
Which versions are affected by CVE-2026-50021?
4 open source packages ship an affected version, including pnpm. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pnpm npm | All versions | 10.34.1 |
pnpm npm | All versions | 10.34.1 |
pnpm npm | From 11.0.0 | 11.4.0 |
pnpm npm | From 11.0.0 | 11.4.0 |
Products include Pnpm Pnpm.
How do I fix CVE-2026-50021?
Upgrade pnpm to a fixed version for your release line: 10.34.1 or 11.4.0.
Is CVE-2026-50021 being exploited?
There is no known exploitation of CVE-2026-50021 in the wild and no public exploit code.
Other vulnerabilities in pnpm
- CVE-2026-50016 pnpm: Transitive dependency alias path traversal allows project path override via symlink replacement
- CVE-2026-55698 pnpm: Project env lockfile can short-circuit package-manager resolution and execute lockfile-selected pnpm bytes
- CVE-2025-69264 pnpm v10+ Bypass "Dependency lifecycle scripts execution disabled by default"
- CVE-2022-26183 Untrusted Search Path in PNPM
- CVE-2026-59195 pnpm: Path traversal in configDependencies env lockfile allows symlink creation outside node_modules/.pnpm-config
Sources
Also known as GHSA-q6j5-fjx5-2mc3, MINI-5fwg-5f27-jj39, ROOT-APP-NPM-CVE-2026-50021.