CVE-2026-67238
Description
A flaw was found in RabbitMQ, a messaging and streaming broker. An authenticated AMQP (Advanced Message Queuing Protocol) client can trigger an atom-table exhaustion by sending specially crafted reply-to queue names for decoding. This can lead to the entire Erlang Virtual Machine (VM) crashing, resulting in a Denial of Service (DoS) for all connected services and users.
Statement
Red Hat rates this flaw MODERATE in products that ship affected RabbitMQ builds using CVSS v3.1; RabbitMQ’s higher severity reflects CVSS v4 scoring of the same attack conditions. An authenticated AMQP 0-9-1 client can send crafted reply-to queue names that create permanent atoms until the atom table is exhausted, crashing the broker and interrupting all virtual hosts.
Mitigation
Restrict AMQP access to trusted clients until an updated build is deployed.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/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
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