Ssrfcheck (< 1.2.0)

The `ssrfcheck` npm package is vulnerable to SSRF bypass due to an incomplete denylist of IP addresses. The package fails to classify the reserved IP address space 224.0.0.0/4 (Multicast) as invalid, allowing potential SSRF attacks. All versions up to and including 1.1.1 are affected. A patch has been released in version 1.2.0.