CVE-2017-0904: Private Address Check Project Private Address Check

High severity, CVSS 8.1. EPSS: 2.4% chance of exploitation in the next 30 days.

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.

Affected products

• Private Address Check Project Private Address Check: before 0.4.0 (fixed in 0.4.0)

Published 2017-11-13. Last modified 2026-06-17.