CVE-2017-0909: Private Address Check Project Private Address Check

Critical severity, CVSS 9.8. EPSS: 2% chance of exploitation in the next 30 days.

The private_address_check ruby gem before 0.4.1 is vulnerable to a bypass due to an incomplete blacklist of common private/local network addresses used to prevent server-side request forgery.

Affected products

• Private Address Check Project Private Address Check: before 0.4.1 (fixed in 0.4.1)

Published 2017-11-16. Last modified 2026-06-17.