Critical Remote Code Execution Vulnerability in Fedora's perl-Net-DNS

Fedora has released an advisory for a critical vulnerability in the perl-Net-DNS module affecting versions 1.53 to 1.56. The vulnerabilities, identified as CVE-2026-64193 and CVE-2026-64194, allow for remote code execution and denial of service through crafted DNS queries. The flaws stem from improper handling of EDNS EXTENDED ERROR and long DNS compression chains. Users are advised to upgrade to version 1.56 to mitigate these risks. The vulnerabilities were published on July 20, 2026, and are confirmed to affect all Fedora systems running the affected versions. The advisory emphasizes the urgency of applying the patch due to the potential for exploitation. The update can be installed using the 'dnf' package manager, and detailed instructions are provided in the advisory.

Key Points: • Critical vulnerabilities in perl-Net-DNS allow remote code execution and DoS. • Affected versions include 1.53 to 1.56; users must upgrade to 1.56. • CVE-2026-64193 and CVE-2026-64194 were published on July 20, 2026.