Summary
RabbitMQ Java client accepts broker frames larger than the negotiated AMQP frame_max
The max body size was enforced to patch CVE-2023-46120, but even though that limit still works, the frame size itself still exceeds the given max size.
Root cause
The Java client records the AMQP 0-9-1 frame_max negotiated during connection tuning, but the socket inbound frame reader continues to validate broker-controlled payload lengths against the much larger maxInboundMessageBodySize limit. A broker peer can therefore send a method frame whose payload is larger than the negotiated frame_max, have it allocated and decoded, and complete the connection handshake instead of being rejected as a protocol violation.
Reported by Team Atlanta.
Impact
The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2026-61634? CVE-2026-61634 is a low-severity improper input validation vulnerability in com.rabbitmq:amqp-client (maven), affecting versions < 5.33.0. It is fixed in 5.33.0. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
- Which versions of com.rabbitmq:amqp-client are affected by CVE-2026-61634? com.rabbitmq:amqp-client (maven) versions < 5.33.0 is affected.
- Is there a fix for CVE-2026-61634? Yes. CVE-2026-61634 is fixed in 5.33.0. Upgrade to this version or later.
- Is CVE-2026-61634 exploitable, and should I be worried? Whether CVE-2026-61634 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-61634 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-61634? Upgrade
com.rabbitmq:amqp-clientto 5.33.0 or later.