Vulnerability · Published Apr 10, 2026 · Assigned by canonical
CVE-2026-5774Juju API Server Denial of Service and Authentication Replay via Unsynchronized Token Map
Medium 6.1
In plain English
A medium-severity race condition in Juju from Canonical. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)6.1Medium
Exploit odds (30 days)0.2%top 84.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/juju/juju | 0.0.0-20260408003526-d395054dc2c3 | GHSA-7m55-2hr4-pw78 |
| Go | github.com/juju/juju | 0.0.0-20260408003526-d395054dc2c3 | GO-2026-5228 |
Affected products (as reported)
Weakness: CWE-362 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- In-Memory Token Store for Discharge Tokens Lacks Concurrency Safety and Persistence vdb-entry, vendor-advisory
- https://github.com/juju/juju/pull/22206 patch, issue-tracking
- https://github.com/juju/juju/pull/22205 patch, issue-tracking