← Vulnerability feed

Vulnerability record · CVE-2026-4370 · published 1 April 2026

CVE-2026-4370: Canonical juju improper certificate validation vulnerability

Canonical · Juju

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.

10.0 CVSS 3.1 Critical EPSS 0.41% · top 67.1% CWE-295 · Improper certificate validationCWE-306 · Missing authentication for critical function
10.0CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/juju/juju/security/advisories/GHSA-gvrj-cjch-728p ExploitVendor Advisory

Track CVE-2026-4370 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2017-9232Juju UNIX domain socket permissions allow local privilege escalation to rootJuju before 1.25.12, 2.0.x before 2.0.4, and 2.1.x before 2.1.3 creates a UNIX domain socket without appropriate permissions. Because the socket is n…EPSS 49%analysed8.8CVE-2026-32693Canonical juju improper access control vulnerabilityIn Juju from version 3.0.0 through 3.6.18, the authorization of the "secret-set" tool is not performed correctly, which allows a grantee to update th…EPSS 0.44%8.8CVE-2025-0928Canonical juju improper authorization vulnerabilityIn Juju versions prior to 3.6.8 and 2.9.52, any authenticated controller user was allowed to upload arbitrary agent binaries to any model or to the c…EPSS 0.58%8.0CVE-2024-7558Canonical juju vulnerabilityJUJU_CONTEXT_ID is a predictable authentication secret. On a Juju machine (non-Kubernetes) or Juju charm container (on Kubernetes), an unprivileged u…EPSS 0.50%7.5CVE-2015-1316Canonical juju vulnerabilityJuju Core's Joyent provider before version 1.25.5 uploads the user's private ssh key.EPSS 1.2%7.1CVE-2025-68153Canonical juju incorrect authorization vulnerabilityJuju is an open source application orchestration engine that enables any application operation on any infrastructure at any scale through special ope…EPSS 0.23%6.9CVE-2025-68152Canonical juju incorrect authorization vulnerabilityJuju is an open source application orchestration engine that enables any application operation on any infrastructure at any scale through special ope…EPSS 0.36%6.6CVE-2026-32694Canonical juju insecure direct object reference vulnerabilityIn Juju from version 3.0.0 through 3.6.18, when a secret owner grants permissions to a secret to a grantee, the secret owner relies exclusively on a …EPSS 0.38%

Source: NIST National Vulnerability Database (record CVE-2026-4370), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.