CVE-2026-5774 PUBLISHED

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

Assigner: canonical
Reserved: 08.04.2026 Published: 10.04.2026 Updated: 10.04.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 6.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	High	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Canonical
Product	Juju
Versions	Default: unaffected affected from 2.0.0 to 2.9.57 (excl.) affected from 3.0.0 to 3.6.21 (excl.) affected from 4.0.0 to 4.0.6 (excl.)

References

Problem Types

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

Impacts

CAPEC-26: Leveraging Race Conditions