CVE-2026-5774 Juju API Server Denial of Service and Authentication Replay via Unsynchronized Token Map

What is CVE-2026-5774?

CVE-2026-5774 is a medium-severity vulnerability in Canonical Juju, published on 10 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

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.

Weakness: CWE-362

Which versions are affected by CVE-2026-5774?

3 open source packages ship an affected version, including github.com/juju/juju. It affects 1 product.

Products include Canonical Juju.

How do I fix CVE-2026-5774?

Upgrade github.com/juju/juju to 0.0.0-20260408003526-d395054dc2c3 or later.

Is CVE-2026-5774 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5774 exists.

Other vulnerabilities in Canonical Juju

• CVE-2026-4370 Improper TLS Client/Server authentication and certificate verification on Database Cluster Critical 10.0
• CVE-2026-5412 Juju CloudSpec API could leak senstive information Critical 9.9
• CVE-2017-9232 Juju uses a UNIX domain socket without setting appropriate permissions Critical 9.8
• CVE-2026-32693 Unauthorized access to Kubernetes secrets in Juju High 8.8
• CVE-2025-0928 Arbitrary executable upload via authenticated endpoint High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-7m55-2hr4-pw78, GO-2026-5228.