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WordPress doesn't allow 0.0.0.0/8 in some contexts, as an attempt to block some types of SSRF:

https://github.com/WordPress/WordPress/blob/abcbee954f4d8baa...

If allocations in 0.0.0.0/8 happen someday, users will probably see similar misfeatures in many applications.




rejecting all of 0.0.0.0/8 was their CVE-2016-2222 fix




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