CVE-2026-34179 Update of type field in restricted TLS certificate allows privilege escalation to cluster admin

What is CVE-2026-34179?

CVE-2026-34179 is a critical vulnerability in Canonical lxd, published on 9 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official 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.

Weakness: CWE-915

Which versions are affected by CVE-2026-34179?

3 open source packages ship an affected version, including github.com/canonical/lxd. It affects 1 product.

Products include Canonical Lxd.

How do I fix CVE-2026-34179?

Apply the vendor's patch.

Is CVE-2026-34179 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34179 exists.

Other vulnerabilities in Canonical lxd

• CVE-2026-66897 Instance template path traversal allows arbitrary host file write as root Critical 9.9
• CVE-2026-62420 Cross-project cluster migration bypasses project restrictions via cluster notification flag Critical 9.9
• CVE-2026-63293 Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root Critical 9.9
• CVE-2026-63294 Root RCE via image backup.yaml symlink Critical 9.9
• CVE-2026-63296 Project restriction bypass via instance migration config override Critical 9.9

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-34179, GHSA-c3h3-89qf-jqm5, GO-2026-5306, UBUNTU-CVE-2026-34179.