CVE-2026-63294: critical vulnerability in Canonical LXD
Root RCE via image backup.yaml symlink
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.9epss 0.9%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Canonical · LXDRelated CVEs — Canonical LXD
In the same product, most dangerous first.
CVE-2026-66897CRITICALInstance template path traversal allows arbitrary host file write as rootEPSS 0.7%CVE-2026-63298HIGHLXD arbitrary lxc.conf directive injection via NVIDIA instance configurationEPSS 0.7%CVE-2026-9640HIGHLXD Snapshot Import Privilege Escalation VulnerabilityEPSS 0.6%CVE-2025-54293HIGHPath Traversal in LXD Instance Log File RetrievalEPSS 0.6%CVE-2026-66898CRITICALPath traversal via unvalidated instance name in backup tarball restore enables root file write / RCEEPSS 0.6%CVE-2026-63293CRITICALArbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as rootEPSS 0.6%