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CVE-2026-11386 is an improper input-validation vulnerability in Canonical ubuntu-pro-client, formerly ubuntu-advantage-tools. The client incorporates the contract-server directives.suites[] and directives.aptURL fields into privileged APT source configuration using Python str.format() without validation, escaping, or filtering of newline characters. A manipulated response can therefore inject attacker-controlled APT repository configuration. The client also passes the unvalidated additionalPackages[] field positionally to a root-executed apt-get install invocation, allowing the injected repository configuration and package-selection data to be combined to install attacker-controlled packages.
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No public exploit code observed for this vulnerability.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Ubuntu Pro Client / ubuntu-advantage-tools vulnerability in how APT source files and package installation inputs are handled from contract server data, enabling attacker-controlled package source injection and malicious package installation that can lead to arbitrary code execution as root.
A critical input validation and injection vulnerability in Canonical ubuntu-pro-client / ubuntu-advantage-tools that allows arbitrary APT directive injection and can lead to remote code execution as root by manipulating contract server response fields used to generate APT source files and package installation commands.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.