CVE-2026-69219Network attack vector

Pre-auth JVM crash via unchecked allocation

Published Aug 18, 2026 · Updated Aug 19, 2026

Denial of service in RabbitMQ Java Client before 5.33.1 allows remote attackers to crash the JVM via a crafted AMQP handshake field. In ValueReader.readBytes, src/main/java/com/rabbitmq/client/impl/ValueReader.java allocates a byte array from the wire-declared contentLength before verifying that the frame actually contains that many bytes, so a LongString or byte-array field can force an approximately 2 GB allocation and OutOfMemoryError. Reachability is pre-authentication during connection.start server-properties parsing, so any application that connects to an attacker-controlled AMQP peer can be terminated before authentication completes.

CVSS severity8.7
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in RabbitMQ Java Client before 5.33.1 allows remote attackers to crash the JVM via a crafted AMQP handshake field. In ValueReader.readBytes, src/main/java/com/rabbitmq/client/impl/ValueReader.java allocates a byte array from the wire-declared contentLength before verifying that the frame actually contains that many bytes, so a LongString or byte-array field can force an approximately 2 GB allocation and OutOfMemoryError. Reachability is pre-authentication during connection.start server-properties parsing, so any application that connects to an attacker-controlled AMQP peer can be terminated before authentication completes.

The record

CVE
CVE-2026-69219
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
RabbitMQ
Product
RabbitMQ Java Client
Classifications
CWE-789, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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=< 5.33.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RabbitMQ · RabbitMQ Java Clientversion=< 5.33.1

Published CVSS scores

8.7GitHub, Inc.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

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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