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CVE-2026-106121— RabbitMQ: JSONReader in the default JSON-RPC mapper never terminates on truncated input, causing DoS

Quick assessment

Affected
rabbitmq rabbitmq-java-client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RabbitMQ Java 客户端库允许 Java 及基于 JVM 的应用程序连接并与 RabbitMQ 节点进行交互。在 5.37.0 版本之前， 方法在输入在引号内的字符串或行注释中间结束时无法终止，因为其字符串和空白字符扫描器在遇到 时不会停止。默认的 会将 JSON-RPC 消息体传递给 JsonRpcServer 和客户端回复的此解析器进行解析。截断的字符串会导致解析器不断追加替换的结束标记，直至耗尽堆内存；而缺少终止换行符的行注释则可能使线程无限期地消耗 CPU，从而导致拒绝服务（Denial of S

CVSS 4.9 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
com.rabbitmq amqp-client < 5.36.1 affected
rabbitmq rabbitmq-java-client < 5.36.1 affected
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I. Basic Information for CVE-2026-106121

Vulnerability Information
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Vulnerability Title
RabbitMQ: JSONReader in the default JSON-RPC mapper never terminates on truncated input, causing DoS
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rabbitmq rabbitmq-java-client < 5.36.1 -
com.rabbitmq amqp-client < 5.36.1 -

II. Public POCs for CVE-2026-106121

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III. Intelligence Information for CVE-2026-106121

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Other References for CVE-2026-106121 (4)

Same Patch Batch · rabbitmq · 2026-10-06 · 3 CVEs total

CVE-2026-106122 6.0 MEDIUM RabbitMQ: Malformed UTF-8 in shortstr properties permanently disables RPC consumers
CVE-2026-106123 5.7 MEDIUM RabbitMQ Java client: plaintext broker credentials leaked in exception message from Connec

IV. Related Vulnerabilities

Same product: rabbitmq-java-client
Same vendor: rabbitmq
Same weakness: CWE-835

V. Comments for CVE-2026-106121

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