CVE-2026-93709: Path Traversal

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.

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Weakness Type (CWE)

CWE-41 CWE-41

References

Other References

https://github.com/PerlDancer/Dancer2/commit/293fce08812b0928f34ab2d7b9357450707c3630.patch https://github.com/PerlDancer/Dancer2/commit/753b385350a54acb8d4b686723890205268634a8.patch https://github.com/PerlDancer/Dancer2/issues/1823 https://metacpan.org/release/CROMEDOME/Dancer2-2.2.0/changes

Frequently Asked Questions

What is 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. 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.

How do I check if I'm vulnerable to CVE-2026-93709? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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