CVE-2026-24046: Backstage has a Possible Symlink Path Traversal in Scaffolder Actions

Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to:

1. Read arbitrary files via the debug:log action by creating a symlink pointing to sensitive files (e.g., /etc/passwd, configuration files, secrets)
2. Delete arbitrary files via the fs:delete action by creating symlinks pointing outside the workspace
3. Write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks

This affects any Backstage deployment where users can create or execute Scaffolder templates.