What should Debian and Ubuntu administrators do first?
Apply the fixed apt package for the exact distribution release and confirm the installed version. Ubuntu also documents disabling retries for a single update as a temporary mitigation in applicable situations; that is not a replacement for installing the vendor fix.
Answered in
APT CVE-2026-109518: Why Redirects and Retries Put Package Verification at RiskA high-severity APT flaw can bypass package file verification in narrow redirect and retry conditions. Here is who is exposed and what to patch.
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