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CVE-2026-63336— RabbitMQ Java client: TrustEverythingTrustManager used by default in useSslProtocol() enables MITM

Quick assessment

Affected
rabbitmq rabbitmq-java-client
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.

RabbitMQ rabbitmq-java-client是RabbitMQ组织的一款信息化产品。 RabbitMQ rabbitmq-java-client 5.33.0之前版本存在加密问题漏洞，该漏洞源于SSL配置不当，接受任意服务器证书（包括自签名证书）且禁用主机名验证，可能导致能够拦截TLS连接的网络攻击者冒充RabbitMQ broker，读取或修改受保护的AMQP流量。

CVSS 5.1 · Medium EPSS 0.18% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
rabbitmq rabbitmq-java-client < 5.33.0 affected
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I. Basic Information for CVE-2026-63336

Vulnerability Information
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Vulnerability Title
RabbitMQ Java client: TrustEverythingTrustManager used by default in useSslProtocol() enables MITM
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
RabbitMQ rabbitmq-java-client 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RabbitMQ rabbitmq-java-client是RabbitMQ组织的一款信息化产品。 RabbitMQ rabbitmq-java-client 5.33.0之前版本存在加密问题漏洞，该漏洞源于SSL配置不当，接受任意服务器证书（包括自签名证书）且禁用主机名验证，可能导致能够拦截TLS连接的网络攻击者冒充RabbitMQ broker，读取或修改受保护的AMQP流量。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rabbitmq rabbitmq-java-client < 5.33.0 -

II. Public POCs for CVE-2026-63336

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III. Intelligence Information for CVE-2026-63336

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Patches & Fixes for CVE-2026-63336 (3)

Vendor Advisories for CVE-2026-63336 (1)

Vendor Pages for CVE-2026-63336 (1)

Same Patch Batch · rabbitmq · 2026-08-18 · 6 CVEs total

CVE-2026-69219 8.7 HIGH RabbitMQ Java client ValueReader: Oversized LongString/bytes length triggers OOM via unche
CVE-2026-69220 8.7 HIGH RabbitMQ Java client ValueReader: Unbounded recursive table/array nesting causes StackOver
CVE-2026-63337 7.5 HIGH RabbitMQ Java client: Unvalidated Class.forName in JSON-RPC ProcedureDescription enables a
CVE-2026-63335 6.3 MEDIUM RabbitMQ Java client malformed body frame triggers raw command assembler exception
CVE-2026-61634 RabbitMQ Java client accepts broker frames larger than the negotiated AMQP frame_max

IV. Related Vulnerabilities

Same product: rabbitmq-java-client
Same vendor: rabbitmq
Same weakness: CWE-295

V. Comments for CVE-2026-63336

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