CVE-2026-34179: In Canonical LXD versions 4.12 through 6.7, the doCertificateUpdate function in lxd/certificates.go does not v

This month

CRITICAL 9.1UPGRADE

CVE-2026-34179 is a critical-severity flaw (CVSS 9.1) affecting lxd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Canonical LXD versions 4.12 through 6.7, the doCertificateUpdate function in lxd/certificates.go does not validate the Type field when handling PUT/PATCH requests to /1.0/certificates/{fingerprint} for restricted TLS certificate users, allowing a remote authenticated attacker to escalate privileges to cluster admin.

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-915
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): Canonical Ltd. · Vendor: canonical

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 10:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

canonical lxd UPGRADE

Affected: >= 4.12 and <= 5.0.6 · >= 5.21.0 and <= 5.21.4 · >= 6.0 and <= 6.7

Fixed in: newer than 6.7

Safe to downgrade to: a release before 4.12

1. Check installed version

apt-cache policy lxd || rpm -q lxd || lxd --version

2. UPGRADE to newer than 6.7 (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 4.12 (Debian / Ubuntu)

apt-cache madison lxd sudo apt install lxd=<VERSION_BEFORE_4.12> 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_4.12> 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.

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.

Quick answers

How do I fix CVE-2026-34179?

lxd: upgrade to newer than 6.7. Exact commands for each OS are on this page.

Is CVE-2026-34179 being exploited?

CVE-2026-34179 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34179 affect?

CVE-2026-34179 affects lxd. Severity is critical (CVSS 9.1). In Canonical LXD versions 4.12 through 6.7, the doCertificateUpdate function in lxd/certificates.go does not validate the Type field when handling PUT/PATCH requests to /1.0/certificates/{fingerprint} for restricted TLS certificate users, a

How urgent is CVE-2026-34179?

Priority 42/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-34178 CRITICAL 9.1 UPGRADE In Canonical LXD before 6.8, the backup import path validates project restrictions against backup/index.yaml i
CVE-2026-34177 CRITICAL 9.1 UPGRADE Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/pro
CVE-2026-9639 MEDIUM 6.5 UPGRADE Nil-pointer dereference in CreateCustomVolumeFromBackup in LXD up to version 6.8 and 5.21 on Linux allows an a
CVE-2026-9640 HIGH 7.2 UPGRADE A privilege escalation vulnerability exists in LXD from 6.0 before 6.9, 5.21.0 before 5.21.5, and 5.0.0 before
CVE-2026-12411 HIGH 8.4 UPGRADE Broken Access Control in the devLXDInstancePatchHandler component of Canonical LXD allows an untrusted guest t

References

← Back to latest CVEs