CVE-2026-67220Network attack vectorHinoki check available

Broker crash via JMS selector atom exhaustion

Published Sep 23, 2026 · Updated Sep 23, 2026

Denial of service in RabbitMQ Server 3.13 and affected 4.x releases allows remote authenticated users to crash a broker node. The JMS topic exchange add_binding/3 path sends the unbounded rjms_erlang_selector value through erl_scan:string/1, which permanently interns every atom literal. Exploitation requires the rabbitmq_jms_topic_exchange plugin and AMQP permissions to read the exchange and write a queue; fewer than 100 crafted bindings can exhaust the node-wide atom table and interrupt every tenant.

CVSS severityUnavailable
Unscored
EPSS probability0.29%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in RabbitMQ Server 3.13 and affected 4.x releases allows remote authenticated users to crash a broker node. The JMS topic exchange add_binding/3 path sends the unbounded rjms_erlang_selector value through erl_scan:string/1, which permanently interns every atom literal. Exploitation requires the rabbitmq_jms_topic_exchange plugin and AMQP permissions to read the exchange and write a queue; fewer than 100 crafted bindings can exhaust the node-wide atom table and interrupt every tenant.

The record

CVE
CVE-2026-67220
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
RabbitMQ
Product
RabbitMQ Server
Classifications
T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.13.0, < 3.13.15
  2. Affected versionversion=>= 4.0.0, < 4.0.20
  3. Affected versionversion=>= 4.1.0, < 4.1.11
  4. Affected versionversion=>= 4.2.0, < 4.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RabbitMQ · RabbitMQ Serverversion=>= 3.13.0, < 3.13.15; version=>= 4.0.0, < 4.0.20; version=>= 4.1.0, < 4.1.11; version=>= 4.2.0, < 4.2.6

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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