CADQuickLook is a code-signed, notarized macOS app that ships with a Sparkle update feed. Vulnerabilities in the file parsers (STEP, IGES, BREP, STL, DXF are all parsed from untrusted files, including by Finder's Quick Look extensions) or in the update mechanism are in scope.
Please report vulnerabilities privately through GitHub's private vulnerability reporting rather than in a public issue. Include the macOS and app versions and, where possible, a file that reproduces the problem.
You should get an acknowledgement within a week. Fixes ship as a new release through the app's update feed.
Only the latest release is supported.