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Vulnerability record · CVE-2026-93712 · published 22 September 2026

CVE-2026-93712: Path traversal vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.55% · top 56.4% CWE-22 · Path traversal Deferred
7.5CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
22 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

LinkTags
https://github.com/PerlDancer/Dancer2/commit/2446a09ffb83fef71cc75c327bd6e4b1f007b885.patch
https://github.com/PerlDancer/Dancer2/security/advisories/GHSA-6xw8-v24c-m783
https://metacpan.org/release/CROMEDOME/Dancer2-2.2.0/changes
http://www.openwall.com/lists/oss-security/2026/09/22/4

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Source: NIST National Vulnerability Database (record CVE-2026-93712), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.