Modified `is_private_ip` in `app/utils/network.py` to fail securely by returning True (blocking the request) when a hostname cannot be resolved. The previous implementation failed open, creating a risk for Server-Side Request Forgery (SSRF) and DNS rebinding attacks.
Updated corresponding tests to expect the secure behavior and correctly appended the security finding to the Sentinel journal.
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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