CVE-2026-34179 — CRITICAL (9.1)

Q: How severe is CVE-2026-34179?

CVE-2026-34179 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-34179?

Check the references section above for vendor advisories and patch information. Affected products include: Canonical Lxd.

Vulnerability Description

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.

CVSS Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Canonical	Lxd	>= 4.12, <= 5.0.6

Related Weaknesses (CWE)

CWE-915

References

https://github.com/canonical/lxd/pull/17936Issue TrackingPatch
https://github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5Third Party AdvisoryExploit
https://github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5Third Party AdvisoryExploit

FAQ

What is CVE-2026-34179?

CVE-2026-34179 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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}...

How severe is CVE-2026-34179?

CVE-2026-34179 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-34179?

Check the references section above for vendor advisories and patch information. Affected products include: Canonical Lxd.