Vulnerability · Published Aug 12, 2026 · Assigned by canonical

CVE-2026-63298LXD arbitrary lxc.conf directive injection via NVIDIA instance configuration

High 8.7

In plain English

A high-severity OS command injection in LXD from Canonical. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 3.1)8.7High

Exploit odds (30 days)0.7%top 47.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

An improper neutralization of special elements vulnerability in LXD's NVIDIA instance configuration handling allows an authenticated attacker to inject arbitrary configuration directives. By supplying newline characters within the 'nvidia.driver.capabilities' or 'nvidia.require.*' configuration values, an attacker can manipulate the generated lxc.conf file. This flaw enables the attacker to execute arbitrary code on the host system with the privileges of the LXD daemon.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	lxd	no fix listed	DEBIAN-CVE-2026-63298
Debian:13	lxd	no fix listed	DEBIAN-CVE-2026-63298

Affected products (as reported)

Vendor	Product	Versions
Canonical	LXD	5.0.0 – before 5.0.85.21.0 – before 5.21.64.0.0 – before 4.0.12

Weakness: CWE-78 · 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-vfh7-q59q-54v2 vdb-entry, vendor-advisory