GHSA-cfcj-hqpf-hccf: @evomap/evolver: Path Traversal in `evolver fetch` default-branch `safeId` allows Hub-controlled overwrite of project files (RCE)

The evolver fetch subcommand in index.js writes Hub-supplied bundled_files[] into a directory derived from a Hub-supplied skill_id. When --out is not used, the path-sanitizing regex permits . characters, allowing a skill_id of .. to escape the skills/ subdirectory and resolve to the user’s current working directory. Combined with the file-extension allow-list (which includes .js/.json/.sh/.py/.md), this lets a malicious Hub overwrite the victim’s index.js, package.json, or other files in cwd, achieving remote code execution on the next invocation of the evolver.