CVE-2026-5774

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

State: Published
Severity: 6.1 Medium
Published: Apr 10, 2026
Updated: Apr 10, 2026
Reserved: Apr 8, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.1 Medium	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	canonical

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
JujuCanonical	2.0.0 to before 2.9.57Affected 3.0.0 to before 3.6.21Affected 4.0.0 to before 4.0.6Affected

References

In-Memory Token Store for Discharge Tokens Lacks Concurrency Safety and Persistencevdb-entryvendor-advisory
https://github.com/juju/juju/pull/22206patchissue-tracking
https://github.com/juju/juju/pull/22205patchissue-tracking

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