PerlDancer Dancer2 up to 2.1.x File Route path traversal

Summaryinfo

A vulnerability labeled as problematic has been found in PerlDancer Dancer2 up to 2.1.x. This vulnerability affects unknown code of the component File Route Handler. Executing a manipulation can lead to path traversal. The identification of this vulnerability is CVE-2026-93712. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in PerlDancer Dancer2 up to 2.1.x and classified as problematic. This vulnerability affects an unknown part of the component File Route Handler. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-93712 since 09/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 2.2.0 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• PerlDancer

Name

• Dancer2

Version

• 2.0
• 2.1

Website

• Product: https://github.com/PerlDancer/Dancer2/

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