# @Mockoon/commons-server: Path traversal in templated \`filePath\` lets a request escape the served directory (prefix-only base check)

Advisory record · `GHSA-8wqc-v2q8-vff2`

- **Identifiers:** `GHSA-8wqc-v2q8-vff2` · `CVE-2026-59149`
- **State:** Confirmed
- **Severity:** CVSS 6.5 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html) · [CWE-23](https://cwe.mitre.org/data/definitions/23.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md)
- **Published:** 11 Sept 2026
- **Updated:** 11 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 Sept 2026, 22:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `@mockoon/commons-server` (npm): affected `<9.7.0`; fixed in `9.7.0`
- `@mockoon/cli` (npm): affected `<9.7.0`; fixed in `9.7.0`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.5 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0048, the 42nd percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-8wqc-v2q8-vff2](https://github.com/advisories/GHSA-8wqc-v2q8-vff2)
- [OSV: GHSA-8wqc-v2q8-vff2](https://osv.dev/vulnerability/GHSA-8wqc-v2q8-vff2)
- <https://github.com/mockoon/mockoon/security/advisories/GHSA-8wqc-v2q8-vff2>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-59149>
- <https://github.com/mockoon/mockoon/pull/2255>
- <https://github.com/mockoon/mockoon/commit/b42bdfb7f82e83f0e81bea8e6fe41adf5ec82585>
- <https://github.com/mockoon/mockoon>
- <https://github.com/mockoon/mockoon/releases/tag/v9.7.0>
- <https://mockoon.com/releases/9.7.0>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-8wqc-v2q8-vff2>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-8wqc-v2q8-vff2/>. Everything for agents: <https://agentprime.io/llms.txt>.