EUVD-2026-61046
GHSA-5xwg-cfvj-gff5
Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N
Network vector, high complexity due to required broker control; no confidentiality or integrity impact confirmed beyond potential memory disclosure and resource allocation abuse.
Primary rating from Vendor (https://github.com/rabbitmq/rabbitmq-java-client).
CVSS VectorVendor: https://github.com/rabbitmq/rabbitmq-java-client
Lifecycle Timeline
3Blast Radius
ecosystem impact- 4 maven packages depend on com.rabbitmq:amqp-client (3 direct, 1 indirect)
Ecosystem-wide dependent count for version 5.33.0.
DescriptionCVE.org
Summary
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.*
AnalysisAI
RabbitMQ Java client (amqp-client) versions prior to 5.33.0 fails to enforce the AMQP 0-9-1 negotiated frame_max limit on inbound socket frames, allowing a malicious or compromised broker peer to send method frames exceeding the protocol-negotiated size. The client allocates and fully decodes these oversized frames rather than rejecting them as protocol violations, effectively nullifying the frame-size protection. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an attacker to control the AMQP broker endpoint that the vulnerable Java client connects to - through deployment of a rogue broker, compromise of an existing broker, or a man-in-the-middle position on the AMQP TCP connection (typically port 5672 or 5671 for TLS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is moderate and highly context-dependent. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade com.rabbitmq:amqp-client to version 5.33.0 or later, which enforces the negotiated frame_max as a hard cap on inbound frame payload sizes for both socket and Netty transport handlers. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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