cwe-22-path-traversal

Path traversal vulnerabilities occur when Java file I/O operations fail to restrict directory access, allowing attackers to use traversal sequences to reach unauthorized files outside the intended base directory.

Securing file path handling requires implementing canonical path validation to confirm the resolved path stays within allowed boundaries, using allowlists for permitted files, and rejecting traversal sequences in user input.

Yes, when a SAST tool flags path traversal risks in Java file access operations, automated remediation can refactor the code by applying deterministic transformations to safely handle and validate file paths.

The best way to prevent unauthorized file access in Java web controllers is to implement secure file path handling that validates canonical paths and rejects directory traversal sequences before processing file I/O operations.

Basic input validation often fails to prevent path traversal because it does not verify canonical paths; secure remediation requires confirming the final resolved path remains within the restricted directory boundary.

Path traversal remediation applies to Java applications with file I/O operations across web controllers and service layers, specifically targeting file download endpoints and file access logic requiring canonical path validation.