Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-63300

CVE-2026-63300CRITICAL

Canonical LXD — Cross-project instance move bypasses all project restrictions allowing host command execution

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  C  H  H  H    9.9   .0054   43.4     —

AFFECTED
  Product  Versions  Fixed
  LXD      5.0.0 –   —

TIMELINE
  Jul 16  Reserved by canonical
  Aug 12  Published (CNA: canonical)
  Sep 11  EXPLOIT PUBLISHED — CVE-2026-63300 (Canonical LXD). Public exploit reference added.

CWE-862 · CNA: canonical · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

An improper validation vulnerability in the instancePostMigration function in lxd/instance_post.go of LXD allows an authenticated attacker with can_create_instances permissions on a restricted project to bypass project-level security restrictions. When migrating an instance between projects, LXD fails to validate the instance's configuration against the target project's enforced restrictions (such as restricted.containers.lowlevel, restricted.devices.*, and restricted.networks.access). An attacker can exploit this by creating a disallowed or high-privilege instance in an unrestricted project and subsequently moving it into the restricted project.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 16, 2026	Reserved	Reserved by canonical
August 12, 2026	Published	Published (CNA: canonical)
September 11, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-63300 (Canonical LXD). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Canonical	LXD	—	5.0.0	—

Weaknesses

CWE-862

References (3)

https://github.com/canonical/lxd/pull/18605 [Exploit, Patch]
https://github.com/canonical/lxd/pull/18651 [Patch]
https://github.com/canonical/lxd/security/advisories/GHSA-5g5r-wh97-qcq2 [Vendor Advisory, Exploit, Mitigation]

Authoritative record: CVE-2026-63300 at cve.org

Vendors: canonical

Weaknesses: CWE-862

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-63300 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.