Highlights
Memory Safety: 2 prior fixes. Scrutinize any change in this area.
src/slic3r/GUI/GUI_App.cpp: most-fixed (2 issues). Treat as high-risk during review.
3 high-severity fixes in this history; regressions here are high-impact.
Recurring patterns
The bug types that recur here, drawn from past fixes, not open vulnerabilities.
Improper Certificate Validation: The application failed to enforce proper signature and certificate verification when loading networking modules on Windows and macOS, creating opportunities for local privilege escalation or malicious code injection (CVE-2025-57521).
Insecure TLS: Insecure TLS configurations, specifically disabling peer and hostname verification (CURLOPT_SSL_VERIFYPEER/CURLOPT_SSL_VERIFYHOST), previously exposed network communications to man-in-the-middle (MitM) attacks.
Path Traversal: Inadequate sanitization of downloaded filenames and URLs allowed path traversal on macOS, which can be leveraged to write files outside of intended directories.