---
id: CVE-2026-93712
title: >-
  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 che…
summary: >-
  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 che…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
product: Dancer2
affected:
  - Dancer2 >= 2.1.0 < 2.2.0
published: '2026-09-22'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:17:12.580'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93712'
references:
  - url: >-
      https://github.com/PerlDancer/Dancer2/commit/2446a09ffb83fef71cc75c327bd6e4b1f007b885.patch
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: >-
      https://github.com/PerlDancer/Dancer2/security/advisories/GHSA-6xw8-v24c-m783
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://metacpan.org/release/CROMEDOME/Dancer2-2.2.0/changes'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/22/4'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
epss: 0.00548
epssPercentile: 0.43494
ingestedAt: '2026-09-22T00:55:54.013Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.