Vulnerability in Canonical Ubuntu 16.04 Lts
CVE-2026-12391
An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) within the pro collect-logs command framework. The utility creates or utilizes predictable temporary file paths or user-acc…
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N.
Affected products
- Canonical Ubuntu 16.04 Lts — versions 37.1ubuntu0~16.04.1
- Canonical Ubuntu 18.04 Lts — versions 37.1ubuntu0~18.04.1
- Canonical Ubuntu 20.04 Lts — versions 37.1ubuntu0~20.04.1
- Canonical Ubuntu 22.04 Lts — versions 37.2ubuntu~22.04.1
- Canonical Ubuntu 24.04 Lts — versions 37.2ubuntu~24.04.1
- Canonical Ubuntu 26.04 Lts — versions 37.2ubuntu0.1
- Canonical Ubuntu-pro-client (Ubuntu-advantage-tools) — versions 0
Weakness classification (CWE)
References
- security@ubuntu.com (vdb-entry)
Frequently asked questions
- What is CVE-2026-12391?
- CVE-2026-12391 is a medium-severity vulnerability in Canonical Ubuntu 16.04 Lts, classified under Improper Link Resolution Before File Access. CVSS score: 5.0/10. Published 2026-07-16.
- How severe is CVE-2026-12391?
- Medium severity. CVSS v3 base score is 5.0 out of 10.