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CVE-2026-4370— Improper TLS Client/Server authentication and certificate verification on Database Cluster

Quick assessment

Affected
Canonical Juju
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juju是Canonical Juju开源的一个开源应用程序编排引擎。 Juju 3.2.0至3.6.19版本和4.0至4.0.4版本存在安全漏洞，该漏洞源于内部Dqlite数据库集群未能执行正确的TLS客户端和服务器身份验证，可能导致未经身份验证的攻击者加入数据库集群并获取对底层数据库的完全读写访问权限。

CVSS 10.0 · Critical EPSS 0.41% · P33
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I. Basic Information for CVE-2026-4370

Vulnerability Information
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Vulnerability Title
Improper TLS Client/Server authentication and certificate verification on Database Cluster
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Juju 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juju是Canonical Juju开源的一个开源应用程序编排引擎。 Juju 3.2.0至3.6.19版本和4.0至4.0.4版本存在安全漏洞，该漏洞源于内部Dqlite数据库集群未能执行正确的TLS客户端和服务器身份验证，可能导致未经身份验证的攻击者加入数据库集群并获取对底层数据库的完全读写访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical Juju 3.2.0 ~ 3.6.20 -

II. Public POCs for CVE-2026-4370

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III. Intelligence Information for CVE-2026-4370

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Vendor Advisories for CVE-2026-4370 (1)

IV. Related Vulnerabilities

Same product: Juju
Same vendor: Canonical
Same weakness: CWE-295

V. Comments for CVE-2026-4370

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