CVE-2026-59149CWE-22CWE-23

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

Medium · published July 9, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
40.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00483 · 40.7th percentile
Weaknesses
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'); CWE-23 · Relative Path Traversal
Published
2026-07-09T18:28Z
EPSS history
Timeline
  • 09 JUL 18:28Z
    Mockoon: Path traversal in templated `filePath` lets a request escape the served directory (prefix-only base check)
    cvelistv5