Bug 2546741 (CVE-2026-106121)

Summary: CVE-2026-106121 com.rabbitmq/amqp-client: rabbitmq-java-client: Denial of Service via malformed JSON payload
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: fmongiar, gmalinko, janstey, jnethert, pdelbell, rstepani
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the RabbitMQ Java client library. When parsing incoming JSON-formatted messages, the built-in parser fails to terminate correctly if an input ends abruptly within an unclosed string or comment. A remote attacker could send a specially crafted, truncated message to trigger an infinite processing loop or exhaust available memory. This behavior can render the affected service unresponsive, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-10-06 18:25:56 UTC 
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.37.0, com.rabbitmq.tools.json.JSONReader.read() fails to terminate when input ends inside a quoted string or a line comment because its string and whitespace scanners do not stop at CharacterIterator.DONE. The default DefaultJsonRpcMapper passes JSON-RPC message bodies to this parser for JsonRpcServer and client replies. A truncated string causes the parser to append replacement end markers until heap exhaustion, while a line comment without a terminating newline can keep a thread consuming CPU indefinitely, resulting in denial of service. This issue is fixed in version 5.37.0.