# CVE-2026-55700: pnpm: stage download writes outside destination via manifest version traversal

> A crafted package manifest allows pnpm stage download to write files outside the intended directory, potentially overwriting arbitrary files.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 25 Jun 2026
- **Updated:** 25 Jun 2026
- **Also known as:** GHSA-v23m-ccfg-pq9h, MINI-3pg3-gp9q-gqgr

## What is CVE-2026-55700?

CVE-2026-55700 is a high-severity path traversal vulnerability in pnpm, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

pnpm is a package manager. From 11.3.0 until 11.5.3, `pnpm stage download` derived a local filename from registry-controlled package name and version fields. A crafted manifest could escape the selected download directory and overwrite another reachable file. The merged fix validates both fields, derives one safe filename, and verifies the final destination before writing. This vulnerability is fixed in 11.5.3.

Weakness: CWE-73 (External Control of File Name or Path), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-55700?

2 open source packages ship an affected version, including pnpm. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `pnpm` | npm | From 11.3.0 | 11.5.3 |
| `pnpm` | npm | From 11.3.0 | 11.5.3 |

Products: Pnpm Pnpm.

## How do I fix CVE-2026-55700?

Upgrade pnpm to 11.5.3 or later.

## Is CVE-2026-55700 being exploited?

There is no known exploitation of CVE-2026-55700 in the wild and no public exploit code.

## Other vulnerabilities in pnpm

- [CVE-2026-50016](https://insights.sbomify.com/CVE-2026-50016/): pnpm: Transitive dependency alias path traversal allows project path override via symlink replacement (high 8.8)
- [CVE-2026-55698](https://insights.sbomify.com/CVE-2026-55698/): pnpm: Project env lockfile can short-circuit package-manager resolution and execute lockfile-selected pnpm bytes (high 8.8)
- [CVE-2025-69264](https://insights.sbomify.com/CVE-2025-69264/): pnpm v10+ Bypass "Dependency lifecycle scripts execution disabled by default" (high 8.8)
- [CVE-2022-26183](https://insights.sbomify.com/CVE-2022-26183/): Untrusted Search Path in PNPM (high 8.8)
- [CVE-2026-59195](https://insights.sbomify.com/CVE-2026-59195/): pnpm: Path traversal in configDependencies env lockfile allows symlink creation outside node_modules/.pnpm-config (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-55700 and fix it if it is affected.

What it is: CVE-2026-55700 is a high-severity path traversal vulnerability in pnpm, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-55700 in the wild and no public exploit code.

Affected packages and fixed versions:
- pnpm (npm): affected from 11.3.0; fixed in 11.5.3
- pnpm (npm): affected from 11.3.0; fixed in 11.5.3

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-55700/ (Markdown: https://insights.sbomify.com/CVE-2026-55700/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-55700
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-55700
- OSV: https://osv.dev/vulnerability/CVE-2026-55700

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-55700/
Summaries are generated and may contain mistakes; the official description above is the record.