It should be pretty easy to validate an IP address. IPv4 addresses are 32-bit unsigned integers, and IPv6 addresses are 128-bit unsigned integers. Things get "interesting" when developers attempt to validate IP addresses as a string. There have been a few interesting vulnerabilities around this issue (CVE-2021-28918, CVE-2021-29921, CVE-2021-29418).
Adventures in Validating IPv4 Addresses, (Thu, Oct 26th)
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