TI-2026-05057 Aliases CVE-2026-5774 GHSA-7m55-2hr4-pw78

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

MEDIUM 60CWE-362Published 2026-04-10 · Updated 2026-04-10

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: High
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00253 16th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed Juju (Canonical): 2.9.57, 3.6.21, 4.0.6github.com/juju/juju (Go): 0.0.0-20260408003526-d395054dc2c3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Canonical	Juju	2.0.0 to before 2.9.57; 3.0.0 to before 3.6.21; 4.0.0 to before 4.0.6	2.9.57, 3.6.21, 4.0.6	Patch available	CNA
—	github.com/juju/juju (Go)	before 0.0.0-20260408003526-d395054dc2c3	0.0.0-20260408003526-d395054dc2c3	Patch available	GHSA-7m55-2hr4-pw78

Juju VendorCanonical Affected 2.0.0 to before 2.9.57; 3.0.0 to before 3.6.21; 4.0.0 to before 4.0.6 Fixed in 2.9.57, 3.6.21, 4.0.6 Patch available CNA
github.com/juju/juju (Go) Vendor— Affected before 0.0.0-20260408003526-d395054dc2c3 Fixed in 0.0.0-20260408003526-d395054dc2c3 Patch available GHSA-7m55-2hr4-pw78

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:canonical:juju::::::::	before 2.9.57; 3.0 to before 3.6.21; 4.0 to before 4.0.6	Vulnerable	Canonical

cpe:2.3:a:canonical:juju:*:*:*:*:*:*:*:* Versions before 2.9.57; 3.0 to before 3.6.21; 4.0 to before 4.0.6 Vulnerable ·Canonical

Remediation

Fix · CNA Juju (Canonical) Fixed in 2.9.57, 3.6.21, 4.0.6
Fix · GHSA-7m55-2hr4-pw78 github.com/juju/juju (Go) Fixed in 0.0.0-20260408003526-d395054dc2c3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-5774
2026-10-03 Alias added: GHSA-7m55-2hr4-pw78

References

Exploit 1

In-Memory Token Store for Discharge Tokens Lacks Concurrency Safety and Persistence

Patch 2

Advisory 1

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

Other 1

https://github.com/juju/juju

TI-2026-03806 Improper TLS Client/Server authentication and certificate verification on Database Cluster CVSS 3.1CRITICAL 10.0
TI-2025-33458 Zip slip vulnerability in Juju CVSS 3.1HIGH 8.8
TI-2025-00786 Arbitrary executable upload via authenticated endpoint CVSS 3.1HIGH 8.8
TI-2017-06681 Juju before 1.25.12, 2.0.x before 2.0.4, and 2.1.x before 2.1.3 uses a UNIX domain socket… CVSS 3.0CRITICAL 9.8
TI-2026-25186 Insecure Direct Object Reference attack via predictable secret ID in Juju CVSS 3.1MEDIUM 6.6
TI-2025-41733 Juju: Resource poisoning CVSS 4.0HIGH 7.1

See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences