by Kastro
Paper/Archive/CVE-2026-62420

CVE-2026-62420

Canonical LXD — Cross-project cluster migration bypasses project restrictions via cluster notification flag

EPSS 0.5%CVSS 9.9
critical.is priorityof 100
39
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 45.4.454 × 209.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project security restrictions during cross-project instance migrations. When moving an instance cross-project to a different cluster member via POST /1.0/instances/{name} with migration: true, project: <target>, and target: <member>, the destination node skips all project restriction checks because the request arrives as an internal cluster notification. An attacker can exploit this to introduce disallowed instance configurations into a restricted project.

Affected

ProductAffectedFixed inSource
LXD5.0.0 – < 5.0.85.0.8CNA
LXD5.21.0 – < 5.21.65.21.6CNA
LXD6.0 – < 6.106.10CNA

Scores by source

canonical (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

exploitgithub.com/canonical/lxd/security/advisories/GHSA-v9wr-9r7q-fh4gpatchgithub.com/canonical/lxd/pull/18651patchgithub.com/canonical/lxd/pull/18605