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CVE-2026-11386 is an input validation and injection vulnerability in Canonical ubuntu-pro-client, formerly ubuntu-advantage-tools. The client constructs APT source configuration files from contract server response data, including the directives.suites[] and directives.aptURL fields, using Python str.format() without escaping, validation, or newline filtering. A malicious or tampered response containing embedded newline characters can inject attacker-controlled APT repository configuration lines into root-owned APT sources. The issue is compounded by the additionalPackages[] field being accepted without validation and passed positionally into a root-executed apt-get install invocation. An attacker who can spoof or manipulate the contract response can therefore cause the client to trust attacker-controlled package sources and install malicious packages, culminating in arbitrary code execution as root. The issue affects ubuntu-pro-client versions earlier than 37.3 and is especially significant because the component is preinstalled on supported Ubuntu Server releases and auto-attaches by default on cloud provider Ubuntu Pro images.
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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.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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