EUVD-2026-57513Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Network-reachable LXD API with an authenticated low-privilege user (PR:L), consistent/low-complexity bypass (AC:L), and a scope change (S:C) as control crosses into a restricted project yielding full C/I/A impact.
Primary rating from Vendor (canonical).
CVSS VectorVendor: canonical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Authorization bypass in Canonical LXD lets an authenticated user with copy privileges smuggle instances carrying disallowed high-privilege configurations into restricted projects, defeating per-project security controls. The root cause is a time-of-check to time-of-use race in which LXD validates project restrictions before configuration merging finishes during cross-project instance copies. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated LXD client (TLS certificate or equivalent) holding permission to create instances and to perform cross-project instance copies into a target project that enforces restrictions - this maps to the CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:C, C:H/I:H/A:H) describes a low-complexity, network-reachable attack requiring only low privileges, with a scope change reflecting that a low-privileged actor in one project escalates control into a restricted project - this is the primary driver of the 9.9 score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade LXD to the fixed release identified in Canonical advisory GHSA-v989-qw7w-xvg4 (https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4); the exact patched version is not stated in the available data, so confirm it directly from that advisory (snap-based installs typically update automatically via the tracked channel). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Canonical LXD deployments using multi-project configurations and immediately restrict instance copy privileges to a minimal set of trusted administrators; enable comprehensive audit logging for all instance copy operations and review access grant history. …
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Same technique Authentication Bypass
View allVendor StatusVendor
SUSE
Severity: CriticalShare
External POC / Exploit Code
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