CVE-2026-93712: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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.
AI Analysis
Technical Summary
Dancer2 versions >=2.1.0 and <2.2.0 for Perl have a CWE-22 path traversal vulnerability in the File route handler. The handler concatenates the request path with the public_dir directory without collapsing relative path segments, allowing escape from the restricted directory via paths like '/../outside.txt' or percent-encoded equivalents. This occurs only if the application configures the File route handler and disables the static_handler check that normally rejects dot segments. Consequently, any file readable by the worker process can be served to unauthenticated requests, including sensitive configuration files located above public_dir.
Potential Impact
An attacker can retrieve arbitrary files readable by the application process outside the intended public directory without authentication. This can lead to disclosure of sensitive information such as configuration files, potentially exposing credentials or other secrets.
Mitigation Recommendations
No official patch or fix is indicated in the provided data. Users should avoid configuring the File route handler with static_handler set to 0 to prevent exposure. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
CVE-2026-93712: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Dancer2 versions >=2.1.0 and <2.2.0 for Perl have a CWE-22 path traversal vulnerability in the File route handler. The handler concatenates the request path with the public_dir directory without collapsing relative path segments, allowing escape from the restricted directory via paths like '/../outside.txt' or percent-encoded equivalents. This occurs only if the application configures the File route handler and disables the static_handler check that normally rejects dot segments. Consequently, any file readable by the worker process can be served to unauthenticated requests, including sensitive configuration files located above public_dir.
Potential Impact
An attacker can retrieve arbitrary files readable by the application process outside the intended public directory without authentication. This can lead to disclosure of sensitive information such as configuration files, potentially exposing credentials or other secrets.
Mitigation Recommendations
No official patch or fix is indicated in the provided data. Users should avoid configuring the File route handler with static_handler set to 0 to prevent exposure. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CPANSec
- Date Reserved
- 2026-09-18T15:07:22.163Z
- State
- PUBLISHED
Threat ID: 6ab1d39c55bf5e2cf5ca3a34
Added to database: 09/22/2026, 01:02:20 UTC
Last enriched: 09/22/2026, 01:16:40 UTC
Last updated: 09/22/2026, 01:59:03 UTC
Views: 5
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