CVE-2026-93709 Details
Description
Dancer2 versions before 2.2.0 for Perl serve a layout as a page when an equivalent spelling of its path misses the guard in the AutoPage handler. The handler compares the request path against the layout directory name as text, while the lookup that follows canonicalises it. A doubled slash, a dot segment, a percent-encoded slash, or a different capitalisation on a case-insensitive filesystem therefore misses the guard. The handler is off by default, enabled with auto_page. The layout wrapping every page is already public, so this discloses one of the application's other layouts.
A vulnerability exists in Dancer2 versions prior to 2.2.0 for Perl, where the AutoPage handler improperly handles layout paths on case-insensitive file systems, such as macOS and Windows. The handler can mistakenly serve a layout template as a regular page when the request path's capitalization differs from the expected format. This issue arises because the handler's path comparison does not account for variations in case or certain path elements, allowing layouts to be rendered as pages and potentially disclosing sensitive information.
Users can upgrade to Dancer2 version 2.2.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 22, 2026CISA-ADP
Assessed Sep 23, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/PerlDancer/Dancer2/commit/293fce08812b0928f34ab2d7b9357450707c3630.patch | CPANSec | Source CodeVendor |
| https://github.com/PerlDancer/Dancer2/commit/753b385350a54acb8d4b686723890205268634a8.patch | CPANSec | Source CodeVendor |
| https://github.com/PerlDancer/Dancer2/issues/1823 | CPANSec | ExploitIssue TrackingTechnical DescriptionVendor |
| https://metacpan.org/release/CROMEDOME/Dancer2-2.2.0/changes | CPANSec | Release Notes |
| http://www.openwall.com/lists/oss-security/2026/09/22/1 | CVE | AdvisoryMailing ListRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-41 | Improper Resolution of Path Equivalence | CPANSec |
Affected Products
| Product | Versions |
|---|---|
| Dancer2 | < 2.2.0 (semver) |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 23, 2026 | CVE Modified | CISA-ADP |
| Sep 22, 2026 | CVE Modified | CVE |
| Sep 22, 2026 | New CVE Received | CPANSec |