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.

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 fun…

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.

Affected products

Canonical Lxd — versions 5.0.0, 5.21.0, 6.0

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security@ubuntu.com (vendor-advisory, vdb-entry)

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.