# CVE-2026-93712: libdancer2-perl: Dancer2 versions from 2.1.0 before 2.2.0 for Perl serve files from outside public_dir via relative path segments in t...

CVE-2026-93712 is fixed in libdancer2-perl on 1 platform by DEBIAN-CVE-2026-93712 (version 2.2.2-1), released October 4, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-93712
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0055
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 22, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libdancer2-perl Debian 14 | 2.2.2-1 | [DEBIAN-CVE-2026-93712](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93712.md) | Oct 4, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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