RabbitMQ Java client: TrustEverythingTrustManager used by default in useSslProtocol() enables MITM
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-295.
Summary
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.0, com.rabbitmq.client.ConnectionFactory.useSslProtocol() and ConnectionFactory.useSslProtocol(String) configure com.rabbitmq.client.TrustEverythingTrustManager and leave hostname verification disabled, causing arbitrary server certificates, including self-signed certificates, to be accepted. A network attacker able to intercept a TLS connection can impersonate the RabbitMQ broker, read protected AMQP traffic, and modify traffic without certificate or hostname validation. The fix changes the production TLS helpers to use the JVM default trust store and enables hostname verification, while retaining an explicitly named development-only no-verification helper. This issue is fixed in version 5.33.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| rabbitmq | rabbitmq-java-client | before 5.33.0 | 5.33.0 | Patch available | CNA |
| — | com.rabbitmq:amqp-client (Maven) | before 5.33.0 | 5.33.0 | Patch available | GHSA-5m9f-rphj-c435 |
- rabbitmq-java-client Vendorrabbitmq Affected before 5.33.0 Fixed in 5.33.0 Patch available CNA
- com.rabbitmq:amqp-client (Maven) Vendor— Affected before 5.33.0 Fixed in 5.33.0 Patch available GHSA-5m9f-rphj-c435
Remediation
- Fix · CNA rabbitmq-java-client (rabbitmq) Fixed in 5.33.0
- Fix · GHSA-5m9f-rphj-c435 com.rabbitmq:amqp-client (Maven) Fixed in 5.33.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-63336
- 2026-10-03 Alias added: GHSA-5m9f-rphj-c435
References
Other 7
- https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-5m9f-rphj-c435
- https://github.com/rabbitmq/rabbitmq-java-client/pull/1999
- https://github.com/rabbitmq/rabbitmq-java-client/pull/2001
- https://github.com/rabbitmq/rabbitmq-java-client/commit/1e7deb2e6020c9793a81385a53ea378ec63b9339
- https://github.com/rabbitmq/rabbitmq-java-client/commit/a4bf571dd368765baaa9cecfae68ce09f1bdcc01
- https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.33.0
- https://github.com/rabbitmq/rabbitmq-java-client
More rabbitmq vulnerabilities
- TI-2026-41154 Improper authentication in rabbitmq-server CVSS 3.1CRITICAL 10.0
- TI-2026-41149 RabbitMQ: UNC SSRF affecting the management UI on Windows CVSS 3.1CRITICAL 10.0
- TI-2026-41158 Resource allocation without limits in rabbitmq-server CVSS 3.1HIGH 7.5
- TI-2026-47695 RabbitMQ: OAuth2 Client Secret Exposed via Unauthenticated JavaScript Endpoint CVSS 4.0HIGH 8.2
- TI-2026-47694 RabbitMQ: JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS CVSS 4.0HIGH 8.2
- TI-2026-45167 RabbitMQ Java client: Unvalidated Class.forName in JSON-RPC ProcedureDescription enables arbitrary class loading CVSS 4.0HIGH 7.5
Sources
- CVE-2026-63336 · CVE Program
- CVE-2026-63336 · NVD
- FIRST EPSS
- GHSA-5m9f-rphj-c435 · GitHub Advisory Database · CC BY 4.0
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