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OpenAdvisories
Medium · 6.5 CVE-2026-59149 EUVD-2026-42684GHSA-8wqc-v2q8-vff2

Mockoon: Path traversal in templated `filePath` lets a request escape the served directory (prefix-only base check)

Published Jul 9, 2026 · Updated Jul 9, 2026 · Assigned by GitHub_M

Description

Mockoon provides way to design and run mock APIs. Prior to 9.7.0, a FILE response whose filePath embeds request data is confined by getSafeFilePath in packages/commons-server/src/libs/server/server.ts 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, allowing an unauthenticated client to read files from sibling paths outside the served directory through HTTP sendFile, WebSocket, or callbacks. This issue is fixed in version 9.7.0.

Affected products

VendorProductAffectedFixed
mockoon mockoon < 9.7.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @mockoon/cli < 9.7.0 9.7.0 GHSA-8wqc-v2q8-vff2
npm @mockoon/commons-server < 9.7.0 9.7.0 GHSA-8wqc-v2q8-vff2

References