Input validation error in RabbitMQ Java Client Library - CVE-2026-61634
Published: July 9, 2026 / Updated: August 19, 2026
Vulnerability identifier: #VU137275
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-61634
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the socket inbound frame reader when processing broker-supplied AMQP frames during connection setup. A remote attacker can send a specially crafted frame larger than the negotiated frame_max to cause a denial of service.
The issue is reachable when the client connects to a malicious or compromised AMQP broker and uses a smaller negotiated frame_max than the inbound body-size limit.
Affected software
RabbitMQ Java Client Library
How to mitigate CVE-2026-61634
Install security update from vendor's website.
RabbitMQ Java Client Library - update to 5.33.0