@Mockoon/commons-server: Path traversal in templated `filePath` lets a request escape the served directory (prefix-only base check) — GHSA-8WQC-V2Q8-VFF2

Summary

## Summary A `FILE` response whose `filePath` embeds request data (e.g. `"/srv/public/{{queryParam 'name'}}"`, the documented way to let the client pick a file) is confined by `getSafeFilePath` with `resolvedPath.startsWith(staticBaseDir)`. That prefix test has no path-separator boundary, so a `../`-escaped path whose absolute form string-prefixes the base directory passes. An unauthenticated client reads files…

Timeline

Published by source

2026-09-11

Risk context

• Reported severity or threat level: medium.
• Reported CVSS score: 6.5 out of 10.
• Reported EPSS value: 0.00483.
• Review exposure for the affected product or family: npm: @mockoon/commons-server | npm: @mockoon/cli.

Product

npm: @mockoon/commons-server | npm: @mockoon/cli

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-8WQC-V2Q8-VFF2

Source

GitHub

Vendor

GitHub

Published by source

2026-09-11

Last source activity

2026-09-11

Additional identifiers

CVE-2026-59149

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.