{"id":"DEBIAN-CVE-2026-93712","details":"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.","modified":"2026-09-23T09:00:23.243872873Z","published":"2026-09-22T01:16:55.957Z","upstream":["CVE-2026-93712"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-93712"}],"affected":[{"package":{"name":"libdancer2-perl","ecosystem":"Debian:12","purl":"pkg:deb/debian/libdancer2-perl?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.400001+dfsg-1","1.0.0+dfsg-1","1.1.0+dfsg-1","1.1.1+dfsg-1","1.1.2+dfsg-1","2.0.1-1","2.1.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93712.json"}},{"package":{"name":"libdancer2-perl","ecosystem":"Debian:13","purl":"pkg:deb/debian/libdancer2-perl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.2+dfsg-1","2.0.1-1","2.1.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93712.json"}},{"package":{"name":"libdancer2-perl","ecosystem":"Debian:14","purl":"pkg:deb/debian/libdancer2-perl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.2+dfsg-1","2.0.1-1","2.1.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93712.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}