Unsafe reflection in RabbitMQ Java Client Library - #VU137271
Published: July 9, 2026
Vulnerability identifier: #VU137271
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: N/A
CWE-ID: CWE-470
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: VMware, Inc
Affected software:
RabbitMQ Java Client Library
RabbitMQ Java Client Library
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to use of externally-controlled input to select classes or code in ProcedureDescription in com.rabbitmq.tools.jsonrpc when processing a crafted JSON-RPC service description from untrusted AMQP messages. A remote attacker can send a crafted system.describe response with attacker-controlled javaReturnType values to execute arbitrary code.
The issue is triggered when a JsonRpcClient connects to a JSON-RPC service, and the selected class may also be used as the expected type for reply parsing.
Remediation
Install security update from vendor's website.