Uncontrolled Memory Allocation in RabbitMQ Java Client Library - CVE-2026-69219
Published: July 9, 2026 / Updated: August 19, 2026
Vulnerability identifier: #VU137269
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69219
CWE-ID: CWE-789
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 memory allocation with excessive size value in ValueReader.readBytes() when processing a LongString or bytes field from an AMQP peer. A remote attacker can send a specially crafted AMQP field with an oversized declared length to cause a denial of service.
The issue can be triggered pre-authentication during connection.start, and successful exploitation can crash the entire JVM with an OutOfMemoryError.
Affected software
RabbitMQ Java Client Library
How to mitigate CVE-2026-69219
Install security update from vendor's website.
RabbitMQ Java Client Library - update to 5.33.1