USN-8996-1: APT vulnerability

Publication date

4 November 2026

Overview

APT could be made to install unverified packages and run programs as an administrator


Packages

  • apt - Advanced front-end for dpkg

Details

Max Justicz discovered that APT incorrectly handled hard links when
encountering redirects and retrying package downloads. A remote on-path
attacker could possibly use this issue to trick APT into installing an
unverified package and achieve remote code execution with root privileges.

Max Justicz discovered that APT incorrectly handled hard links when
encountering redirects and retrying package downloads. A remote on-path
attacker could possibly use this issue to trick APT into installing an
unverified package and achieve remote code execution with root privileges.

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
26.10 stonking apt –  3.3.3ubuntu0.1
26.04 LTS resolute apt –  3.2.1ubuntu0.1
24.04 LTS noble apt –  2.8.4ubuntu0.1
22.04 LTS jammy apt –  2.4.15ubuntu0.1
20.04 LTS focal apt –  2.0.12+esm1  
18.04 LTS bionic apt –  1.6.19+esm1  
16.04 LTS xenial apt –  1.2.36+esm1  
14.04 LTS trusty apt –  1.0.1ubuntu2.24+esm4  

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.


Have additional questions?

Talk to a member of the team ›