---
id: CVE-2026-63335
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 5.31.0, inbound AMQP
  command assembly in
  src/main/java/com/rabbitmq/client/impl/CommandAssembler.java proces…
severity: medium
cwe:
  - CWE-20
vendor: rabbitmq
product: 'com.rabbitmq:amqp-client'
affected:
  - 'com.rabbitmq:amqp-client <= 5.30.0'
patched:
  - 'com.rabbitmq:amqp-client 5.31.0'
published: '2026-08-18'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:32:09.380'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63335'
references:
  - url: >-
      https://github.com/rabbitmq/rabbitmq-java-client/commit/31735344d9f9dfc53740b67f06e560e8846b9322
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-java-client/commit/abd6d60d4e2bfc1a327dc90ab246b2e8aca1f33b
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-java-client/pull/1959'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-java-client/pull/1960'
    label: security-advisories@github.com
  - url: 'https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.31.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-qx7j-jv8m-fppr
    label: security-advisories@github.com
  - url: >-
      https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-qx7j-jv8m-fppr
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-qx7j-jv8m-fppr'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00515
epssPercentile: 0.41411
aliases:
  - GHSA-qx7j-jv8m-fppr
ecosystem: maven
ingestedAt: '2026-08-18T17:20:36.522Z'
---

## Overview

The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.31.0, inbound AMQP command assembly in src/main/java/com/rabbitmq/client/impl/CommandAssembler.java processes a content-bearing method and header whose remainingBodyBytes value is smaller than a following AMQP.FRAME_BODY payload. CommandAssembler.consumeBodyFrame subtracts the peer-controlled payload length before validating that it fits, drives remainingBodyBytes negative, and throws a raw UnsupportedOperationException instead of MalformedFrameException. A malicious or compromised broker peer can send this malformed sequence on an open nonzero channel to terminate frame processing and close the client connection, causing denial of service for work using that connection. This issue is fixed in version 5.31.0.

## Remediation

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

## Package advisory (CVE-2026-63335)

Affected packages:

- `com.rabbitmq:amqp-client <= 5.30.0`

Patched in:

- `com.rabbitmq:amqp-client 5.31.0`

Source: https://github.com/advisories/GHSA-qx7j-jv8m-fppr