CVE-2024-7774: Langchain Path Traversal vulnerability

The vulnerability stems from three key functions:

1. getFullPath() was vulnerable due to insufficient path resolution/validation (fixed by adding path.resolve() and common path checks).
2. getParsedFile() lacked key validation before file access (fixed by adding regex validation).
3. mdelete() is implicated in advisory descriptions as an attack vector, though not directly shown in diffs. Confidence is medium here as the class's deletion logic would depend on getFullPath(). The commit patches and CVE description explicitly identify these methods as vulnerable entry points.