CVE-2026-9494ubuntu-pro-client Information Disclosure via Cleartext Bearer Token Exposure in Process Command Line
Updated under an hour ago ()
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It affects Canonical ubuntu-pro-client (ubuntu-advantage-tools) and 7 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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An information disclosure vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client validates Ubuntu Pro APT credentials by executing /usr/lib/apt/apt-helper using the download-file command. During this process, the secret bearer token is embedded directly in the cleartext URL component passed via the command-line arguments (argv), resulting in a URL format such as https://bearer:<token>@esm.ubuntu.com/.../. On systems utilizing a default-mounted /proc file system where process-hiding mitigations (such as hidepid) are disabled, an unprivileged local attacker can monitor system processes and read the sensitive bearer token directly from /proc/cmdline while the helper process is actively running. This leaked token can subsequently be used to gain unauthorized access to the victim's Ubuntu Pro or Expanded Security Maintenance (ESM) repositories.
- CVSS
- 5.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-214
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- canonical
- NVD analysis
- Awaiting Analysis
- Record last updated
- Jul 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Canonical ubuntu-pro-client (ubuntu-advantage-tools) canonical:ubuntu_pro_client_ubuntu_advantage_tools (from the name) | before 37.3 | CNA record |
Canonical Ubuntu 26.04 LTS canonical:ubuntu_26.04_lts (from the name) | 37.2ubuntu0.1 not affected | CNA record |
Canonical Ubuntu 24.04 LTS canonical:ubuntu_24.04_lts (from the name) | 37.2ubuntu~24.04.1 not affected | CNA record |
Canonical Ubuntu 22.04 LTS canonical:ubuntu_22.04_lts (from the name) | 37.2ubuntu~22.04.1 not affected | CNA record |
Canonical Ubuntu 20.04 LTS canonical:ubuntu_20.04_lts (from the name) | 37.1ubuntu0~20.04.1 not affected | CNA record |
Canonical Ubuntu 18.04 LTS canonical:ubuntu_18.04_lts (from the name) | 37.1ubuntu0~18.04.1 not affected | CNA record |
Canonical Ubuntu 16.04 LTS canonical:ubuntu_16.04_lts (from the name) | 37.1ubuntu0~16.04.1 not affected | CNA record |
Canonical Ubuntu 14.04 LTS canonical:ubuntu_14.04_lts (from the name) | 19.7ubuntu0.1 not affected | CNA record |
References
- https://ubuntu.com/security/CVE-2026-9494vdb-entry
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.