Resource exhaustion in Canonical Lxd
CVE-2026-63299
An authorization bypass vulnerability in LXD allows an authenticated user to bypass project-level disk and volume limits. Two related code paths fail to verify resource limits during volume operations: the storagePoolVolumeTypePostMove function omits the limits.AllowVolumeCreation check before moving a volume across projects, and volume snapshot restore operations skip the AllowVolumeUpdate check when the configuration is nil (Config == nil). An attacker can exploit these flaws to allocate storage resources that exceed the administrative limits configured for a project.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Canonical Lxd — versions 5.0.0, 5.21.0, 6.0
Weakness classification (CWE)
References
- github.com/canonical/lxd/security/advisories/GHSA-5h78-p252-989h (Exploit, vendor-advisory, Mitigation, vdb-entry, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-63299?
- CVE-2026-63299 is a critical-severity vulnerability in Canonical Lxd, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 9.9/10. Published 2026-08-12.
- How severe is CVE-2026-63299?
- Critical severity. CVSS v3 base score is 9.9 out of 10.