CVE-2026-3351 Authorization Bypass in LXD GET /1.0/certificates Endpoint

What is CVE-2026-3351?

CVE-2026-3351 is a low-severity missing authorization vulnerability in Canonical lxd, published on 3 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Improper authorization in the API endpoint GET /1.0/certificates in Canonical LXD 6.6 on Linux allows an authenticated, restricted user to enumerate all certificate fingerprints trusted by the lxd server.

Weakness: CWE-862

Which versions are affected by CVE-2026-3351?

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-2026-3351?

Upgrade github.com/canonical/lxd to 0.0.0-20260224152359-d936c90d47cf or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-3351 being exploited?

There is no known exploitation of CVE-2026-3351 in the wild and no public exploit code.

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 GHSA-crmg-9m86-636r, GO-2026-4595, UBUNTU-CVE-2026-3351.