CVE-2026-93712 Affecting libdancer2-perl package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published22 Sept 2026
- disclosed22 Sept 2026
Introduced: 22 Sep 2026
NewCVE-2026-93712 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest libdancer2-perl.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libdancer2-perl package and not the libdancer2-perl package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.
References
- https://advisory.echohq.com/cve/CVE-2026-93712
- 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