CVE-2026-93709 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.
Attackers can access internal layout files by bypassing path guards in the AutoPage handler, disclosing application structure when auto_page is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93709?
CVE-2026-93709 is a medium-severity vulnerability, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-41
Which versions are affected by CVE-2026-93709?
How do I fix CVE-2026-93709?
Upgrade to a fixed version.
Is CVE-2026-93709 being exploited?
There is no known exploitation of CVE-2026-93709 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93709, GHSA-8fpv-59mj-6jfr, UBUNTU-CVE-2026-93709.