---
id: CVE-2026-63337
title: >-
  The RabbitMQ Java client library allows Java and JVM-based applications to
  connect to and interact with RabbitMQ nodes
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.tools.jsonrpc.ProcedureDescription receives a javaReturnType
  value in an untrusted syst…
severity: high
cwe:
  - CWE-470
  - CWE-502
vendor: rabbitmq
product: 'com.rabbitmq:amqp-client'
affected:
  - 'com.rabbitmq:amqp-client < 5.33.0'
patched:
  - 'com.rabbitmq:amqp-client 5.33.0'
published: '2026-08-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:05:53.723'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63337'
references:
  - url: >-
      https://github.com/rabbitmq/rabbitmq-java-client/commit/0032f75f9dc3df847f94b2b85a16119250bf63cb
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-java-client/commit/9f8e7efd0c648f235dc0e96232ae7efa75ea4fa8
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-java-client/pull/2000'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-java-client/pull/2002'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.33.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-6g32-pxv4-2wfj
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-6g32-pxv4-2wfj
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-6g32-pxv4-2wfj'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63337.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-63337'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2518029'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-63337'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63337'
tags:
  - nvd
  - ghsa
  - maven
  - csaf
  - vex
  - red-hat
epss: 0.00557
epssPercentile: 0.44038
aliases:
  - GHSA-6g32-pxv4-2wfj
ecosystem: maven
ingestedAt: '2026-08-18T17:20:36.574Z'
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-63337)

Affected packages:

- `com.rabbitmq:amqp-client < 5.33.0`

Patched in:

- `com.rabbitmq:amqp-client 5.33.0`

Source: https://github.com/advisories/GHSA-6g32-pxv4-2wfj

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat Fuse 7 · no fix planned: Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat Fuse 7 · updated 2026-09-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63337.json)