CVE-2026-63297

NameCVE-2026-63297
DescriptionAn 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.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
lxd (PTS)bookworm, bookworm (security)5.0.2-5+deb12u6vulnerable
trixie (security), trixie5.0.2+git20231211.1364ae4-9+deb13u7vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
lxdsourcebookworm(unfixed)end-of-life
lxdsource(unstable)(unfixed)

Notes

[bookworm] - lxd <end-of-life> (EOL in bookworm LTS)
https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4

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