CVE-2026-93712

Description

Dancer2 versions from 2.1.0 before 2.2.0 for Perl serve files from outside public_dir via relative path segments in the File route handler. The handler joins the request path onto public_dir without collapsing relative segments, and checks only that the result is a readable regular file. A request for `/../outside.txt` escapes public_dir, and percent-encoding the dots reaches the same file. The handler is off by default. An application is affected once it names File in route_handlers and sets static_handler to 0, which otherwise refuses a dot segment before the route runs. Any file the worker process can read is served to an unauthenticated request, including the application's config.yml above public_dir.

Weakness classification

• 9b29abf9-4ab0-4765-b253-1875cd9b441e: CWE-22

Primary references

• 9b29abf9-4ab0-4765-b253-1875cd9b441e
• 9b29abf9-4ab0-4765-b253-1875cd9b441e
• 9b29abf9-4ab0-4765-b253-1875cd9b441e
• af854a3a-2127-422b-91ae-364da2661108