SB2026070937 - Multiple vulnerabilities in RabbitMQ Java Client Library
Published: July 9, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Uncontrolled Memory Allocation (CVE-ID: N/A)
CWE-ID: CWE-789 - Uncontrolled Memory Allocation
CVSSv4: 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/E:U/U:Green
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.
2) Uncontrolled Recursion (CVE-ID: N/A)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: 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/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in ValueReader.readTable(), readArray(), and readFieldValue() when parsing AMQP table and array values from server frames. A remote attacker can send a specially crafted deeply nested table structure to cause a denial of service.
Exploitation is possible before authentication via the initial connection.start frame, and a machine-in-the-middle can also trigger the issue.
Remediation
Install update from vendor's website.