CVE-2017-0904
The private_address_check ruby gem before 0.4.0 is vulnerable to a bypass due to use of Ruby’s Resolv.getaddresses method, which is OS-dependent and should not be relied upon for security measures, such as when used to blacklist private network addresses to prevent server-side request forgery.
Date published : 2017-11-13
https://github.com/jtdowney/private_address_check/commit/58a0d7fe31de339c0117160567a5b33ad82b46af