Input validation error in RabbitMQ Java Client Library - CVE-2026-63335
Published: July 9, 2026 / Updated: August 19, 2026
Vulnerability identifier: #VU137276
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63335
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in CommandAssembler when processing malformed AMQP content header and body frames from a connected broker peer. A remote user can send a specially crafted frame sequence to cause a denial of service.
Exploitation requires a broker peer that the client has connected to and an open non-zero channel that can receive a content-bearing server-to-client method.
Affected software
RabbitMQ Java Client Library
How to mitigate CVE-2026-63335
Install security update from vendor's website.
RabbitMQ Java Client Library - update to 5.31.0