CVE-2026-11386 Affecting ubuntu-advantage-tools package, versions <37.2ubuntu~22.04.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2204-UBUNTUADVANTAGETOOLS-17995353
- published16 Jul 2026
- disclosed16 Jul 2026
Introduced: 16 Jul 2026
CVE-2026-11386 (opens in a new tab)How to fix?
Upgrade Ubuntu:22.04 ubuntu-advantage-tools to version 37.2ubuntu~22.04.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ubuntu-advantage-tools package and not the ubuntu-advantage-tools package as distributed by Ubuntu.
See How to fix? for Ubuntu:22.04 relevant fixed versions and status.
An input validation and injection vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client constructs APT source files (such as /etc/apt/sources.list.d/ubuntu-.list or their DEB822 equivalents) using data received directly from the contract server response via the directives.suites[] and directives.aptURL fields. Because the client utilizes Python's str.format() to write these files without performing escaping, validation, or newline character filtering, a malicious or tampered contract response containing embedded newline (\n) characters can successfully inject arbitrary, attacker-controlled deb configuration lines into root-owned APT sources. When combined with the unvalidated additionalPackages[] field—which is passed positionally into a root-executed apt-get install command—an attacker capable of spoofing or manipulating the contract response (e.g., via a compromised internal infrastructure, an intercepted connection utilizing a trusted CA, or local logical bugs) can force the client to fetch and install malicious packages. This ultimately leads to arbitrary code execution with root privileges on the affected system. This component is preinstalled on supported Ubuntu Server releases and auto-attaches by default on cloud provider Ubuntu Pro images.