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CVE-2026-63335— RabbitMQ Java client malformed body frame triggers raw command assembler exception

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 rabbitmq-java-client是RabbitMQ组织的一款信息化产品。 RabbitMQ rabbitmq-java-client 5.31.0之前版本存在输入验证错误漏洞，该漏洞源于对AMQP命令组装中remainingBodyBytes值的验证不当，可能允许恶意或受损的broker对端发送畸形序列，导致帧处理终止并关闭客户端连接，造成拒绝服务。

CVSS 6.3 · Medium EPSS 0.29% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
rabbitmq rabbitmq-java-client < 5.31.0 affected
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I. Basic Information for CVE-2026-63335

Vulnerability Information
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Vulnerability Title
RabbitMQ Java client malformed body frame triggers raw command assembler exception
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 5.31.0, 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
RabbitMQ rabbitmq-java-client 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RabbitMQ rabbitmq-java-client是RabbitMQ组织的一款信息化产品。 RabbitMQ rabbitmq-java-client 5.31.0之前版本存在输入验证错误漏洞，该漏洞源于对AMQP命令组装中remainingBodyBytes值的验证不当，可能允许恶意或受损的broker对端发送畸形序列，导致帧处理终止并关闭客户端连接，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rabbitmq rabbitmq-java-client < 5.31.0 -

II. Public POCs for CVE-2026-63335

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III. Intelligence Information for CVE-2026-63335

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Patches & Fixes for CVE-2026-63335 (2)

Vendor Advisories for CVE-2026-63335 (1)

Vendor Pages for CVE-2026-63335 (1)

Same Patch Batch · rabbitmq · 2026-08-18 · 6 CVEs total

CVE-2026-69219 8.7 HIGH RabbitMQ Java client ValueReader: Oversized LongString/bytes length triggers OOM via unche
CVE-2026-69220 8.7 HIGH RabbitMQ Java client ValueReader: Unbounded recursive table/array nesting causes StackOver
CVE-2026-63337 7.5 HIGH RabbitMQ Java client: Unvalidated Class.forName in JSON-RPC ProcedureDescription enables a
CVE-2026-63336 5.1 MEDIUM RabbitMQ Java client: TrustEverythingTrustManager used by default in useSslProtocol() enab
CVE-2026-61634 RabbitMQ Java client accepts broker frames larger than the negotiated AMQP frame_max

IV. Related Vulnerabilities

Same product: rabbitmq-java-client
Same vendor: rabbitmq
Same weakness: CWE-20

V. Comments for CVE-2026-63335

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