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

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Medium severity · published Apr 10, 2026

CVE-2026-5774

Juju API Server Denial of Service and Authentication Replay via Unsynchronized Token Map

6.4

CVSS

0.2%

EPSS

No

On KEV

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.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

Attack vector

Network

Complexity

High

Privileges

Low

User interaction

None

Confidentiality

Low

Integrity

Low

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.2% · higher than 16% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

JU

Juju · Canonical

2.0.0 before 2.9.57; 3.0.0 before 3.6.21; 4.0.0 before 4.0.6 · source: vendor, NVD

Affected product

JU

Juju

Canonical

All Juju CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-5774

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-5774

Issue Tracking

https://github.com/juju/juju/pull/22205

Issue Tracking

https://github.com/juju/juju/pull/22206

Exploit

https://github.com/juju/juju/security/advisories/GHSA-7m55-2hr4-pw78