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9.9 Critical

CVE-2026-63297 An authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated…

Description

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.

Affected products and versions

Product Affected versions Fixed in
LXD 5.21 5.21.0 → < 5.21.6 5.21.6
LXD 5.0 5.0.0 → < 5.0.8 5.0.8

References

Timeline

  1. Published
  2. Last modified

Other CVEs of LXD

The 47 CVEs of LXD →
CVE-2026-112816 Improper certificate validation in the HTTPS listener in Canonical LXD 4.0.14, 5.0.10, 5.21.8, 6.9 before 4.0.15,… 10.0 Critical CVE-2026-87798 Improper link resolution in the recursive file pull feature of the LXD CLI client in Canonical LXD versions 4.0.2 up… 5.8 Medium CVE-2026-87799 Improper link resolution in the migration receive path in Canonical LXD versions 4.0 and later (fixed in 4.0.14, 5.0.10,… 9.9 Critical CVE-2026-97335 Incorrect authorization in the custom storage volume creation endpoint in Canonical LXD versions 5.0.0 and later… 7.7 High
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