Vulnerability in Canonical Juju
CVE-2026-5774
Improper synchronization of the userTokens map in the API server in Canonical Juju 4.0.5, 3.6.20, and 2.9.56 may allow an authenticated user to possibly cause a denial of service on the server or possibly reuse a single-use discharge token.
Vulnerability class: Race Condition
EPSS: 0.002 (15.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H.
Affected products
- Canonical Juju — versions 2.0.0, 3.0.0, 4.0.0
Weakness classification (CWE)
References
- security@ubuntu.com (Exploit, vendor-advisory, Third Party Advisory, vdb-entry)
- security@ubuntu.com (issue-tracking, patch, Issue Tracking)
- security@ubuntu.com (issue-tracking, patch, Issue Tracking)
Frequently asked questions
- What is CVE-2026-5774?
- CVE-2026-5774 is a medium-severity vulnerability in Canonical Juju, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.4/10. Published 2026-04-10.
- How severe is CVE-2026-5774?
- Medium severity. CVSS v3 base score is 6.4 out of 10.