Secuno
ENNL
Book demo

CVE-2026-63299

Canonical Lxd denial of service

9.9 CRITICALPublic exploitEPSS 0.59%
  1. Published12 Aug 2026

Description

An authorization bypass vulnerability in LXD allows an authenticated user to bypass project-level disk and volume limits. Two related code paths fail to verify resource limits during volume operations: the storagePoolVolumeTypePostMove function omits the limits.AllowVolumeCreation check before moving a volume across projects, and volume snapshot restore operations skip the AllowVolumeUpdate check when the configuration is nil (Config == nil). An attacker can exploit these flaws to allocate storage resources that exceed the administrative limits configured for a project.

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 < 6.10

Remediation

Fixed in
Canonical Lxd≥ 5.0.8

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1031028.6
Pexip Infinity before 41.0 is affected by improper input validation in the signaling…
CVE-2026-1031018.6
Pexip Infinity 30.0 through 40.x before 41.0 is affected by improper input validation…
CVE-2026-824399.8
Description The DRPC server kept a map from function name to request queue and created…
CVE-2026-478919.8
A Spring WebFlux application that relies on the Aalto XML processor to parse XML input…
CVE-2026-735418.2
Allocation of Resources Without Limits or Throttling in ZenHive mpp allows an…
CVE-2026-748789.8
openssl_encrypt versions before 1.4.0 use an in-memory rate limiter for TOTP…

Frequently asked

Is CVE-2026-63299 being actively exploited?

CVE-2026-63299 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.59%.

How severe is CVE-2026-63299?

CVE-2026-63299 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.59% probability of exploitation.

Which products are affected by CVE-2026-63299?

Affected products include Canonical Lxd.

How do I fix CVE-2026-63299?

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-2026-63299 against the real software inventory on every managed device, as each hourly inventory arrives. 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.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

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