Net::CIDR::Lite vulnerabilities

Summary

Dave Rolsky discovered that Net::CIDR::Lite did not properly handle extraneous zero characters at the beginning of an IP address string. A remote attacker could possibly use this issue to bypass access controls that are based on IP addresses. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2021-47154) It was discovered that Net::CIDR::Lite did not properly validate the IPv6 group count when handling uncompressed IPv6 addresses. A remote attacker could possibly use this issue to bypass access controls. (CVE-2026-40198) It was discovered that Net::CIDR::Lite mishandled IPv4 mapped IPv6 addresses. A remote attacker could possibly use this issue to bypass access controls that are based on IP addresses. (CVE-2026-40199) Affected Ubuntu releases: 26.04, 25.10, 24.04, 22.04, 20.04, 18.04, 16.04. CVEs: CVE-2026-40198, CVE-2021-47154, CVE-2026-40199.