CVE-2026-69219
published 2026-08-18CVE-2026-69219: The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.1…
PriorityP352high8.7CVSS 4.0
AVNACLATNPRNUINVCNVINVAHSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.73%
53.5th percentile
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.1, src/main/java/com/rabbitmq/client/impl/ValueReader.java uses ValueReader.readBytes to accept a wire-declared contentLength below Integer.MAX_VALUE and allocate a byte array before checking the bytes available in the frame. A malicious AMQP peer can send a LongString or byte-array field with type tag S and a declared length such as 0x7FFFFFFE during the pre-authentication connection.start server-properties table, causing an approximately 2 GB allocation and OutOfMemoryError before readFully consumes data. The resulting memory exhaustion can terminate the JVM and cause denial of service. This issue is fixed in version 5.33.1.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| rabbitmq | rabbitmq-java-client | < 5.33.1 | 5.33.1 |
CVSS provenance
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat8.7HIGH
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Red Hat
com.rabbitmq/amqp-client: RabbitMQ Java client: Denial of Service via oversized memory allocation during pre-authentication
vendor_redhat·2026-08-18·CVSS 8.7
CVE-2026-69219 [HIGH] CWE-770 com.rabbitmq/amqp-client: RabbitMQ Java client: Denial of Service via oversized memory allocation during pre-authentication
com.rabbitmq/amqp-client: RabbitMQ Java client: Denial of Service via oversized memory allocation during pre-authentication
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.1, src/main/java/com/rabbitmq/client/impl/ValueReader.java uses ValueReader.readBytes to accept a wire-declared contentLength below Integer.MAX_VALUE and allocate a byte array before checking the bytes available in the frame. A malicious AMQP peer can send a LongString or byte-array field with type tag S and a declared length such as 0x7FFFFFFE during the pre-authentication connection.start server-properties table, causing an approximately 2 GB allocation and OutOfMemoryError before readFully consumes data. The resulting memory exhaust
GHSA
RabbitMQ Java client ValueReader: Oversized LongString/bytes length triggers OOM via unchecked allocation
ghsa·2026-08-18
CVE-2026-69219 [HIGH] CWE-789 RabbitMQ Java client ValueReader: Oversized LongString/bytes length triggers OOM via unchecked allocation
RabbitMQ Java client ValueReader: Oversized LongString/bytes length triggers OOM via unchecked allocation
## Summary
`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.
## Vulnerable Code
`src/main/java/com/rabbitmq/client/impl/ValueReader.java` lines 83-95:
```java
private static byte[] readBytes(final DataInputStream in) throws IOException {
final long contentLength = unsignedExtend(in.readInt());
if(contentLength < Integer.MAX_VALUE) {
final byte[] buffer = new byte[(int)contentLength]; // allocates before reading
in.readFully(buffer);
return buffer;
}
}
```
## Attack Scenario
A malicious AMQP server sends a LongString fi
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/rabbitmq/rabbitmq-java-client/commit/388209356c6478088efce4d8a07b68e73837a7a0https://github.com/rabbitmq/rabbitmq-java-client/commit/6a87a8dcdc8b4cc4b961a7cdd388276446e5dfb2https://github.com/rabbitmq/rabbitmq-java-client/pull/2007https://github.com/rabbitmq/rabbitmq-java-client/pull/2008https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.33.1https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-68mj-5wr7-6fgg
2026-08-18
Published