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CVE-2026-63297

Canonical Lxd broken access control

9.9 CRITICALPublic exploitEPSS 0.34%
  1. Published12 Aug 2026

Description

An authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated attacker to bypass target project restrictions during cross-project instance copies. When copying an instance to a target project, LXD performs restriction checks before configuration merging is complete, creating a time-of-check to time-of-use (TOCTOU) condition. An attacker can exploit this flaw to copy instances with disallowed high-privilege configurations into restricted projects, bypassing security controls.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Canonical Lxd≥ 5.0.0 < 5.0.8 · ≥ 5.1 < 5.21.6 · ≥ 6.0 < 6.9

Remediation

Fixed in
Canonical Lxd≥ 5.0.8

References

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Frequently asked

Is CVE-2026-63297 being actively exploited?

CVE-2026-63297 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.34%.

How severe is CVE-2026-63297?

CVE-2026-63297 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.34% probability of exploitation.

Which products are affected by CVE-2026-63297?

Affected products include Canonical Lxd.

How do I fix CVE-2026-63297?

Upgrade affected software to a fixed version, for example Canonical Lxd 5.0.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-63297 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.