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CVE-2026-4370

Canonical Juju authentication bypass

10.0 CRITICALPublic exploitEPSS 0.41%
  1. Published1 Apr 2026

Description

A vulnerability was identified in Juju from version 3.2.0 until 3.6.19 and from version 4.0 until 4.0.4, where the internal Dqlite database cluster fails to perform proper TLS client and server authentication. Specifically, the Juju controller's database endpoint does not validate client certificates when a new node attempts to join the cluster. An unauthenticated attacker with network reachability to the Juju controller's Dqlite port can exploit this flaw to join the database cluster. Once joined, the attacker gains full read and write access to the underlying database, allowing for total data compromise.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Canonical Juju≥ 3.2.0 < 3.6.20 · ≥ 4.0 < 4.0.5

Remediation

Fixed in
Canonical Juju≥ 3.6.20

References

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Frequently asked

Is CVE-2026-4370 being actively exploited?

CVE-2026-4370 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.41%.

How severe is CVE-2026-4370?

CVE-2026-4370 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.41% probability of exploitation.

Which products are affected by CVE-2026-4370?

Affected products include Canonical Juju.

How do I fix CVE-2026-4370?

Upgrade affected software to a fixed version, for example Canonical Juju 3.6.20 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-4370 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.