A vulnerability in the ObsidianReader class of the run-llama/llamaindex repository, specifically in version 0.12.27, allows for hardlink-based path traversal. This flaw permits attackers to bypass path restrictions and access sensitive system files, such as /etc/passwd, by exploiting hardlinks. The vulnerability arises from inadequate handling of hardlinks in the loaddata() method, where the security checks fail to differentiate between real files and hardlinks. This issue is resolved in version 0.5.2.