CVE-2026-63299: canonical lxd
Vulnerability summary
CVE-2026-63299 is a critical (CVSS 9.9) vulnerability in canonical lxd. EPSS estimates a 0.59% chance of exploitation in the next 30 days, higher than 47% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 12-08-2026PublishedVulnerability first disclosed.
- 12-08-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 4 sources · 1 version- CVE.orgCNA8.5HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated9.9CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.9CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.59%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
+0.19 pp
From 0.40% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundLxd
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Canonical1 product
- lxd≥ 5.21.0, < 5.21.6 | ≥ 5.0.0, < 5.0.8 | ≥ 5.1, < 5.21.6 | ≥ 6.0, < 6.10
Debian1 product
- lxdAll versions (No fix recorded)
Ubuntu1 product
- lxdAll versions (No fix recorded)
3 vendors · 3 products
References
4 links- github.com/canonical/lxd/security/advisories/GHSA-5h78-p252-989hVDB EntryVendor AdvisoryREPORTExploitMitigation
