What is CVE-2026-15226?

CVE-2026-15226 is a high-severity vulnerability in Canonical Ubuntu 16.04 Lts, classified under CWE-250. CVSS score: 8.4/10. Published 2026-07-21.

How severe is CVE-2026-15226?

High severity. CVSS v3 base score is 8.4 out of 10.

Vulnerability in Canonical Ubuntu 16.04 Lts

CVE-2026-15226

A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine). The default seccomp security templates generated by the engine to restrict system calls do not filter o…

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

Affected products

Canonical Ubuntu 16.04 Lts — versions 2.61.4ubuntu0.16.04.1+esm3
Canonical Ubuntu 18.04 Lts — versions 2.61.4ubuntu0.18.04.1+esm3
Canonical Ubuntu 20.04 Lts — versions 2.67.1+20.04ubuntu1~esm2
Canonical Ubuntu 22.04 Lts — versions 2.76+ubuntu22.04.1
Canonical Ubuntu 24.04 Lts — versions 2.76+ubuntu24.04.1
Canonical Ubuntu 26.04 Lts — versions 2.76+ubuntu26.04.3

Weakness classification (CWE)

CWE-250

References

security@ubuntu.com (issue-tracking, vdb-entry)

Frequently asked questions

What is CVE-2026-15226?: CVE-2026-15226 is a high-severity vulnerability in Canonical Ubuntu 16.04 Lts, classified under CWE-250. CVSS score: 8.4/10. Published 2026-07-21.
How severe is CVE-2026-15226?: High severity. CVSS v3 base score is 8.4 out of 10.