Auth bypass in Canonical Lxd
CVE-2026-63295
An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass project-level container isolation restrictions. When a project is configured with restrictions on container privileges (such as enforcing restricted.containers.privilege=isolated), LXD fails to enforce the requirement if an instance configuration omits the security.idmap.isolated key. An attacker can exploit this flaw by creating or updating an instance without explicitly setting security.idmap.isolated, bypassing the target project's security constraints.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.003 (25.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Canonical Lxd — versions 4.0.0, 5.0.0, 5.21.0
Weakness classification (CWE)
References
- github.com/canonical/lxd/security/advisories/GHSA-7vp9-3vmp-c5jm (Exploit, vendor-advisory, vdb-entry, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-63295?
- CVE-2026-63295 is a medium-severity vulnerability in Canonical Lxd, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-08-12.
- How severe is CVE-2026-63295?
- Medium severity. CVSS v3 base score is 4.3 out of 10.