PatchTheCVECVE-2026-63296: An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project restric
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CRITICAL 9.9UPGRADE
CVE-2026-63296 is a critical-severity flaw (CVSS 9.9) affecting lxd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project restrictions during instance migration. When migrating an instance to a target project, LXD accepts configuration overrides without validating the new configuration against the target project's enforced restrictions. An attacker can exploit this flaw to move instances with disallowed high-privilege configurations into restricted projects, bypass
Why this priority
- Critical severity
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.9 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 62%) |
| CISA exploited list | No |
| Weakness | CWE-863 |
| Published | 2026-08-12 |
| Last modified | 2026-10-23 |
Publisher (CNA): Canonical Ltd. · Vendor: canonical
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
canonical lxd UPGRADE
Affected: >= 5.0.0 and < 5.0.8 · >= 5.1 and < 5.21.6 · >= 6.0 and < 6.10
Fixed in: 5.0.8, 5.21.6, 6.10
Safe to downgrade to: a release before 5.0.0
1. Check installed version
apt-cache policy lxd || rpm -q lxd || lxd --version
2. UPGRADE to 5.0.8 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade lxd
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade lxd
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)
apt-cache madison lxd
sudo apt install lxd=<VERSION_BEFORE_5.0.0>
sudo apt-mark hold lxd
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list lxd
sudo dnf downgrade lxd-<VERSION_BEFORE_5.0.0>
sudo dnf versionlock add lxd
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Exact fixes by distribution
Fedora 46 · rubygem-eventmachine · FIXED · 1.2.7-37.fc46 · FEDORA-2026-7194c202a2 · source
sudo dnf upgrade --advisory=FEDORA-2026-7194c202a2
Debian 12 · lxd · NO FIX YET
Debian 13 · lxd · NO FIX YET
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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