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.tools.jsonrpc.ProcedureDescription receives a javaReturnType value in an untrusted system.describe response and passes it through JSONUtil.tryFill, setJavaReturnType, and computeReturnTypeAsJavaClass to Class.forName(javaReturnType) with initialization enabled. An attacker able to answer the JsonRpcClient request through a shared broker or network interception can select a class already present in the victim JVM and trigger its static initializer, while JsonRpcClient.java later passes getReturnType output to mapper.parse and may also create type confusion. Successful exploitation can affect confidentiality, integrity, and availability in the client process. This issue is fixed in version 5.33.0.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.tools.jsonrpc.ProcedureDescription receives a javaReturnType
    value in an untrusted system.describe response and passes it through JSONUtil.tryFill, setJavaReturnType,
    and computeReturnTypeAsJavaClass to Class.forName(javaReturnType) with initialization enabled. An attacker
    able to answer the JsonRpcClient request through a shared broker or network interception can select a
    class already present in the victim JVM and trigger its static initializer, while JsonRpcClient.java later
    passes getReturnType output to mapper.parse and may also create type confusion. Successful exploitation
    can affect confidentiality, integrity, and availability in the client process. This issue is fixed in
    version 5.33.0. (CVE-2026-63337)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.tools.jsonrpc.ProcedureDescription receives a javaReturnType     value in an untrusted system.describe response and passes it through JSONUtil.tryFill, setJavaReturnType,     and computeReturnTypeAsJavaClass to Class.forName(javaReturnType) with initialization enabled. An attacker     able to answer the JsonRpcClient request through a shared broker or network interception can select a     class already present in the victim JVM and trigger its static initializer, while JsonRpcClient.java later     passes getReturnType output to mapper.parse and may also create type confusion. Successful exploitation     can affect confidentiality, integrity, and availability in the client process. This issue is fixed in     version 5.33.0. (CVE-2026-63337)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
457073	Echo: com.rabbitmq:amqp-client: security update to 5.33.0	Tenable Cloud Security	Echo Local Security Checks	Local	high
457073	Echo: com.rabbitmq:amqp-client: security update to 5.33.0	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
338028	Linux Distros Unpatched Vulnerability : CVE-2026-63337	Nessus	Misc.	Local	high
446059	SCA: security update for com.rabbitmq:amqp-client (GHSA-6g32-pxv4-2wfj)	Tenable Cloud Security	SCA Checks	Local	high
446059	SCA: security update for com.rabbitmq:amqp-client (GHSA-6g32-pxv4-2wfj)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-63337

high

Tenable Plugins

high

high

high

high

high