Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-63337— RabbitMQ Java client: Unvalidated Class.forName in JSON-RPC ProcedureDescription enables arbitrary class loading

Quick assessment

Affected
rabbitmq rabbitmq-java-client
Exploitation
Public or AI PoC available; prioritize validation
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 5.33.0之前版本存在代码注入漏洞，该漏洞源于对system.describe响应中javaReturnType参数的不安全反射调用，可能导致攻击者通过共享代理或网络拦截触发目标JVM中类的静态初始化器并造成类型混淆，影响客户端进程的机密性、完整性和可用性。

CVSS 7.5 · High EPSS 0.32% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
rabbitmq rabbitmq-java-client < 5.33.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-63337

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
RabbitMQ Java client: Unvalidated Class.forName in JSON-RPC ProcedureDescription enables arbitrary class loading
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 5.33.0, com.rabbitmq.tools.jsonrpc.ProcedureDescription receives a javaReturnType value in an untrusted system.describe response and passes it through JSONUtil.tryFill, setJavaReturnType, and computeReturnTypeAsJavaClass to Class.forName(javaReturnType) with initialization enabled. An attacker able to answer the JsonRpcClient request through a shared broker or network interception can select a class already present in the victim JVM and trigger its static initializer, while JsonRpcClient.java later passes getReturnType output to mapper.parse and may also create type confusion. Successful exploitation can affect confidentiality, integrity, and availability in the client process. This issue is fixed in version 5.33.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部可控制的输入来选择类或代码(不安全的反射)
Source: CVE Program / CVE List V5
Vulnerability Title
RabbitMQ rabbitmq-java-client 代码注入漏洞
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 5.33.0之前版本存在代码注入漏洞，该漏洞源于对system.describe响应中javaReturnType参数的不安全反射调用，可能导致攻击者通过共享代理或网络拦截触发目标JVM中类的静态初始化器并造成类型混淆，影响客户端进程的机密性、完整性和可用性。
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 < 5.33.0 -

II. Public POCs for CVE-2026-63337

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10872 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-63337

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-63337 (4)

Vendor Advisories for CVE-2026-63337 (1)

Vendor Pages for CVE-2026-63337 (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-2026-63335 6.3 MEDIUM RabbitMQ Java client malformed body frame triggers raw command assembler exception
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-470

V. Comments for CVE-2026-63337

No comments yet

Leave a comment