PYSEC-2026-2458 docling-graph has SSRF via Missing Internal IP Validation in URLInputHandler

Impact The URLInputHandler class in doclinggraph/core/input/handlers.py makes HTTP requests to user-supplied URLs without validating whether the target resolves to a private, loopback, or link-local IP address. The URLValidator only checks for a valid scheme and non-empty netloc, performing no...