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Vulnerability · Published Aug 18, 2026 · Assigned by GitHub_M

CVE-2026-69219RabbitMQ Java client ValueReader: Oversized LongString/bytes length triggers OOM via unchecked allocation

High 8.7

In plain English

A high-severity security flaw in rabbitmq-java-client from rabbitmq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.7%top 45.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rabbitmq-java-clientno fix listedDEBIAN-CVE-2026-69219
Debian:13rabbitmq-java-clientno fix listedDEBIAN-CVE-2026-69219
Mavencom.rabbitmq:amqp-client5.33.1GHSA-68mj-5wr7-6fgg
Ubuntu:22.04:LTSrabbitmq-java-clientno fix listedUBUNTU-CVE-2026-69219
Ubuntu:24.04:LTSrabbitmq-java-clientno fix listedUBUNTU-CVE-2026-69219
Ubuntu:26.04:LTSrabbitmq-java-clientno fix listedUBUNTU-CVE-2026-69219
Ubuntu:26.10rabbitmq-java-clientno fix listedUBUNTU-CVE-2026-69219

Affected products (as reported)

VendorProductVersions
rabbitmq rabbitmq-java-client < 5.33.1

Weakness: CWE-789 · Vector: 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

References