CVE-2011-3634: methods/https.cc in apt before 0.8.11 accepts connections when the certificate host name fails validation a...

Security readout for executives and security teams

Older apt HTTPS handling could accept a repository connection even when the server certificate name did not match the host. An attacker able to sit between a system and its package repository could potentially capture repository credentials. The source bundle does not show active exploitation or a CVSS score. Exposure is most likely on legacy Debian or Ubuntu-family systems using apt versions before 0.8.11 with HTTPS package repositories, especially where repository credentials are configured. Current exposure should be uncommon unless old systems, frozen images, or unsupported appliances remain in use. Treat as a legacy hygiene issue unless affected package-management infrastructure remains in production. Prioritize systems with repository credentials, build pipelines, or privileged package sources because credential compromise can undermine software supply-chain trust. Mitigation focus: Upgrade apt to 0.8.11 or a vendor-backported fixed package.; Review Ubuntu USN-1283-1 and Debian apt changelog guidance.; Identify and retire unsupported legacy systems still running affected apt versions..

Prepared

Jun 14, 2026, 14:50 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.