What is CVE-2026-34177?

CVE-2026-34177 is a critical-severity vulnerability in Canonical Lxd, classified under Incomplete List of Disallowed Inputs. CVSS score: 9.1/10. Published 2026-04-09.

How severe is CVE-2026-34177?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Canonical Lxd

CVE-2026-34177

Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits raw.apparmor and raw.qemu.conf from the set of keys blocked under the restricted.virtual…

EPSS: 0.004 (28.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Canonical Lxd — versions 4.12.0, 5.1.0, 6.0.0

Weakness classification (CWE)

CWE-184 — Incomplete List of Disallowed Inputs

References

security@ubuntu.com (vendor-advisory, Third Party Advisory, vdb-entry)
security@ubuntu.com (issue-tracking, patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-34177?: CVE-2026-34177 is a critical-severity vulnerability in Canonical Lxd, classified under Incomplete List of Disallowed Inputs. CVSS score: 9.1/10. Published 2026-04-09.
How severe is CVE-2026-34177?: Critical severity. CVSS v3 base score is 9.1 out of 10.