CVE-2026-69219: RabbitMQ Java client ValueReader Oversized LongString/bytes Length Triggers OOM Vulnerability
HIGHCVE-2026-69219 is a HIGH oversized longstring/bytes length triggers oom vulnerability (CWE-789: Memory Allocation with Excessive Size Value) affecting RabbitMQ Java client ValueReader libraries in the Maven ecosystem. The issue involves oversized longstring/bytes length triggers oom via unchecked allocation. Remediation is available by upgrading affected packages to version 5.33.1.
CVE-2026-69219 at a Glance
How to Fix CVE-2026-69219
To remediate this vulnerability, upgrade all affected RabbitMQ Java client ValueReader dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>com.rabbitmq</groupId>
<artifactId>amqp-client</artifactId>
<version>5.33.1</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=com.rabbitmqHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-69219, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=com.rabbitmqAnalyze the terminal output to locate any version of RabbitMQ Java client ValueReader in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.33.1), your application is affected.
Note: The mvn dependency:tree -Dincludes=com.rabbitmq command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-789: Memory Allocation with Excessive Size Value, where the product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. In RabbitMQ Java client ValueReader, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-69219 Affected RabbitMQ Java client ValueReader Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
com.rabbitmq:amqp-client
|
Maven |
< 5.33.1
|
5.33.1
|
References
Frequently Asked Questions
What is CVE-2026-69219?
Which RabbitMQ Java client ValueReader versions are affected?
What version fixes CVE-2026-69219?
Is amqp-client affected?
What CWE is associated with CVE-2026-69219?
How can I check Maven dependencies for CVE-2026-69219?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-68mj-5wr7-6fgg",
"modified" : "2026-08-18T16:32:21Z",
"published" : "2026-08-18T16:32:20Z",
"aliases" : [ "CVE-2026-69219" ],
"summary" : "RabbitMQ Java client ValueReader: Oversized LongString/bytes length triggers OOM via unchecked allocation",
"details" : "## Summary\n\n`ValueReader.readBytes()` allocates a byte array sized by a wire-declared content length without validating it against actual frame data. A malicious AMQP peer triggers OOM by declaring a ~2GB string/bytes field.\n\n## Vulnerable Code\n\n`src/main/java/com/rabbitmq/client/impl/ValueReader.java` lines 83-95:\n\n```java\nprivate static byte[] readBytes(final DataInputStream in) throws IOException {\n final long contentLength = unsignedExtend(in.readInt());\n if(contentLength < Integer.MAX_VALUE) {\n final byte[] buffer = new byte[(int)contentLength]; // allocates before reading\n in.readFully(buffer);\n return buffer;\n }\n}\n```\n\n## Attack Scenario\n\nA malicious AMQP server sends a LongString field (type tag 'S') with declared length `0x7FFFFFFE` (2,147,483,646). The check `contentLength < Integer.MAX_VALUE` passes. `new byte[2147483646]` attempts ~2GB allocation, causing `OutOfMemoryError` before `readFully()` attempts to read data.\n\nThe allocation size is attacker-controlled and is NOT validated against the frame size or `TruncatedInputStream` bounds. Exploitable pre-authentication via `connection.start` server-properties table.\n\n## Impact\n\nDenial of service via JVM `OutOfMemoryError`. Crashes the entire JVM.\n\n## CWE\n\nCWE-789: Memory Allocation with Excessive Size Value\n\n## Remediation\n\nValidate `contentLength` against the frame's remaining bytes or the negotiated max frame size (default 131,072) before allocating.",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "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"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "com.rabbitmq:amqp-client"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "5.33.1"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 5.33.0"
}
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-68mj-5wr7-6fgg"
}, {
"type" : "WEB",
"url" : "https://github.com/rabbitmq/rabbitmq-java-client/pull/2007"
}, {
"type" : "WEB",
"url" : "https://github.com/rabbitmq/rabbitmq-java-client/pull/2008"
}, {
"type" : "WEB",
"url" : "https://github.com/rabbitmq/rabbitmq-java-client/commit/388209356c6478088efce4d8a07b68e73837a7a0"
}, {
"type" : "WEB",
"url" : "https://github.com/rabbitmq/rabbitmq-java-client/commit/6a87a8dcdc8b4cc4b961a7cdd388276446e5dfb2"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/rabbitmq/rabbitmq-java-client"
}, {
"type" : "WEB",
"url" : "https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.33.1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-789" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-08-18T16:32:20Z",
"nvd_published_at" : null
}
}