Bug 2546737 (CVE-2026-106122)

Summary: CVE-2026-106122 com.rabbitmq/amqp-client: RabbitMQ Java client: Denial of service via malformed UTF-8 string decoding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: fmongiar, gmalinko, janstey, jnethert, pdelbell, rstepani
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the RabbitMQ Java client library. A remote attacker capable of submitting Remote Procedure Call (RPC) messages with malformed UTF-8 character sequences can cause a Denial of Service (DoS). When the client library decodes and re-encodes an invalid property string, it exceeds internal protocol size limits and throws an unhandled exception before acknowledging the message. As a result, the message broker repeatedly requeues the malformed message, repeatedly crashing consuming applications and halting message queue operations.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-10-06 18:23:34 UTC 
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.36.0, ValueReader.readShortstr decodes malformed UTF-8 bytes into replacement characters that can re-encode beyond the AMQP shortstr limit enforced by ValueWriter.writeShortstr. An attacker who can submit an RPC message with a malformed echoed property can cause reply publication in RpcServer.mainloop() or tutorial-style consumers to throw an unchecked exception before acknowledgement. The broker requeues the message, allowing the same message to disable replacement consumers until the queue is purged. This issue is fixed in version 5.36.0.