CVE-2026-4370: CWE-295 Improper certificate validation in 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.
AI Analysis
Technical Summary
This vulnerability in Juju involves improper certificate validation (CWE-295) in the internal Dqlite database cluster. Specifically, the Juju controller's database endpoint fails to authenticate client certificates during node join operations, allowing an attacker with network reachability to the Dqlite port to join the cluster without authentication. Exploitation results in full read and write access to the database, compromising confidentiality, integrity, and availability of the data. The vulnerability affects Juju versions 3.2.0 to 3.6.19 and 4.0 to 4.0.4 and has a CVSS 3.1 base score of 10.0, indicating critical severity.
Potential Impact
An attacker who can reach the Juju controller's Dqlite port can join the database cluster without authentication. This grants the attacker full read and write privileges on the underlying database, enabling total compromise of data confidentiality, integrity, and availability within the Juju environment.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict network access to the Juju controller's Dqlite port to trusted hosts only to reduce exposure.
CVE-2026-4370: CWE-295 Improper certificate validation in Canonical Juju
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Juju involves improper certificate validation (CWE-295) in the internal Dqlite database cluster. Specifically, the Juju controller's database endpoint fails to authenticate client certificates during node join operations, allowing an attacker with network reachability to the Dqlite port to join the cluster without authentication. Exploitation results in full read and write access to the database, compromising confidentiality, integrity, and availability of the data. The vulnerability affects Juju versions 3.2.0 to 3.6.19 and 4.0 to 4.0.4 and has a CVSS 3.1 base score of 10.0, indicating critical severity.
Potential Impact
An attacker who can reach the Juju controller's Dqlite port can join the database cluster without authentication. This grants the attacker full read and write privileges on the underlying database, enabling total compromise of data confidentiality, integrity, and availability within the Juju environment.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict network access to the Juju controller's Dqlite port to trusted hosts only to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- canonical
- Date Reserved
- 2026-03-18T08:46:09.947Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69ccd979e6bfc5ba1dae024d
Added to database: 4/1/2026, 8:38:17 AM
Last enriched: 4/8/2026, 10:45:07 AM
Last updated: 5/16/2026, 12:44:15 PM
Views: 156
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.