CVE-2026-92550
Description
A flaw was found in Apache Qpid Broker-J. An unauthenticated remote attacker could exploit this vulnerability by sending specially crafted messages with manipulated type size or count parameters to the AMQP (Advanced Message Queuing Protocol) decoder. This causes excessive memory allocation, leading to a Denial of Service (DoS) by exhausting available system resources.
Statement
This vulnerability is rated as Important because unauthenticated remote attackers can exhaust host memory without possessing valid credentials, resulting in a total loss of broker availability. In typical Red Hat deployments, such as distributed integration workflows using Red Hat JBoss Fuse, messaging endpoints are accessible over internal networks to process incoming AMQP traffic. Because the flaw is triggered prior to authentication during protocol decoding, any reachable broker listener can be terminated abruptly, interrupting critical communications across connected client applications.
Mitigation
Restrict network access to the AMQP messaging listeners so that only trusted client systems and application hosts can establish connections. Because this flaw is triggered during protocol decoding prior to authentication, limiting network exposure effectively reduces the attack surface.
Network access can be restricted to authorized subnets using `firewalld` (adjusting for the configured AMQP listener port, such as default TCP port 5672 or 5671 for AMQPS):
bash
firewall-cmd --permanent --zone=trusted --add-source=192.168.1.0/24
firewall-cmd --permanent --remove-port=5672/tcp --zone=public
firewall-cmd --reload
Caveats: Network filtering does not prevent attacks originating from trusted subnets or compromised internal hosts. Verify that all legitimate clients and broker instances are explicitly permitted before modifying firewall settings. Reloading firewall configurations takes effect immediately and may sever unauthorized active sessions.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
