A path traversal issue exists in the `pop()` function within `stash.py`. The function uses `os.path.exists()` to verify parent directories, which follows symlinks. If an intermediate directory is a symlink pointing outside the worktree, an attacker can write arbitrary files to the filesystem. For example, a malicious repository can be crafted to write a payload into `.git/hooks/post-checkout`, leading to remote code execution during the next checkout operation. The `validate path()` function fails to detect filesystem symlinks, and `build file from blob()` lacks symlink protection.