Vulnerability · Published Aug 12, 2026 · Assigned by canonical
CVE-2026-63293Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root
Critical 9.9
In plain English
A critical-severity security flaw in LXD from Canonical. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Official description
A link following vulnerability in LXD allows an attacker to achieve arbitrary file read and write operations on the host system. When importing or unpacking an image archive, LXD fails to validate whether the metadata.yaml file is a symbolic link. An attacker can exploit this flaw by providing a crafted image archive with a symlinked metadata.yaml file pointing to target file paths on the host system.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | lxd | no fix listed | DEBIAN-CVE-2026-63293 |
| Debian:13 | lxd | no fix listed | DEBIAN-CVE-2026-63293 |
Affected products (as reported)
Weakness: CWE-59 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References
- https://github.com/canonical/lxd/security/advisories/GHSA-j825-cg34-5fr5 vdb-entry, vendor-advisory