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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.

PUBLISHED Reserved 2026-03-18 | Published 2026-04-01 | Updated 2026-04-08 | Assigner canonical




CRITICAL: 10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Problem types

CWE-295 Improper certificate validation

CWE-306 Missing authentication for critical function

Product status

Default status
unaffected

3.2.0 (semver) before 3.6.20
affected

4.0 (semver) before 4.0.4
affected

Credits

Harry Pidcock finder

Thomas Miller analyst

Joseph Phillips remediation developer

Ian Booth coordinator

References

github.com/juju/juju/security/advisories/GHSA-gvrj-cjch-728p

cve.org (CVE-2026-4370)

nvd.nist.gov (CVE-2026-4370)

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