Vulnerability in Canonical Lxd
CVE-2026-63294
A link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of crafted image or backup archives, LXD fails to properly validate and confine the backup.yaml file when it exists as a symbolic link. An attacker can exploit this flaw by providing a malicious archive with a symlinked backup.yaml file, causing LXD to process unconfined configuration metadata and execute arbitrary commands with root privileges.
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: 0.009 (57.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.009 · 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-fv82-v4fj-mm4m (Exploit, vendor-advisory, Third Party Advisory, Mitigation, vdb-entry)
Frequently asked questions
- What is CVE-2026-63294?
- CVE-2026-63294 is a critical-severity vulnerability in Canonical Lxd, classified under Improper Link Resolution Before File Access. CVSS score: 9.9/10. Published 2026-08-12.
- How severe is CVE-2026-63294?
- Critical severity. CVSS v3 base score is 9.9 out of 10.