How severe is CVE-2026-63296?

CVE-2026-63296 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-63296 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-63296?

CVE-2026-63296 affects Canonical Lxd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-63296?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2026-63296 published?

CVE-2026-63296 was published on 2026-08-12 and last updated on 2026-09-11.

CVE-2026-63296

CVE-2026-63296 is a critical-severity vulnerability in Canonical Lxd with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Canonical Lxd
Published: 2026-08-12
Last modified: 2026-09-11

Description

An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project restrictions during instance migration. When migrating an instance to a target project, LXD accepts configuration overrides without validating the new configuration against the target project's enforced restrictions. An attacker can exploit this flaw to move instances with disallowed high-privilege configurations into restricted projects, bypassing security controls.

Frequently asked questions

What is CVE-2026-63296?: An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project restrictions during instance migration. When migrating an instance to a target project, LXD accepts configuration overrides without validating the new configuration against the target project's enforced restrictions. An attacker can exploit this flaw to move instances with disallowed high-privilege configurations into restricted projects, bypassing security controls.
How severe is CVE-2026-63296?: CVE-2026-63296 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-63296 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-63296?: CVE-2026-63296 affects Canonical Lxd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-63296?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-63296 published?: CVE-2026-63296 was published on 2026-08-12 and last updated on 2026-09-11.

References

https://github.com/canonical/lxd/security/advisories/GHSA-gcr9-5q6r-w625

Affected products (1)

cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*

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