Log in Start free

Vulnerability · Published Sep 16, 2026 · Assigned by GitHub_M

CVE-2026-75516RabbitMQ Java client: Frame-level OOM: Math.min(maxInboundMessageBodySize, 0) defeats frame size enforcement

High 8.7

In plain English

A high-severity resource allocation without limits 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 0.6% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.6%top 53.7% 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 5.34.0, AMQConnection.start() applies Math.min(maxInboundMessageBodySize, frameMax) after Connection.Tune negotiation even though AMQP defines frameMax value zero as unlimited and ConnectionFactory.DEFAULT_FRAME_MAX is zero. When the client default and server-negotiated value are both zero, the result is passed to Utils.framePayloadLimit(int), which interprets zero as Integer.MAX_VALUE and disables the configured maxInboundMessageBodySize cap. A malicious AMQP server, or a man-in-the-middle attacker able to modify Connection.Tune and inject frames into the connection, can then send an oversized frame of any frame type, causing Frame.readFrom() to allocate a large byte array before content-level validation and potentially terminate the client process through memory exhaustion. This issue is fixed in version 5.34.0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rabbitmq-java-clientno fix listedDEBIAN-CVE-2026-75516
Debian:13rabbitmq-java-clientno fix listedDEBIAN-CVE-2026-75516
Mavencom.rabbitmq:amqp-client5.34.0GHSA-jh4v-gfqj-7rhx
Ubuntu:22.04:LTSrabbitmq-java-clientno fix listedUBUNTU-CVE-2026-75516
Ubuntu:24.04:LTSrabbitmq-java-clientno fix listedUBUNTU-CVE-2026-75516
Ubuntu:26.04:LTSrabbitmq-java-clientno fix listedUBUNTU-CVE-2026-75516
Ubuntu:26.10rabbitmq-java-clientno fix listedUBUNTU-CVE-2026-75516

Affected products (as reported)

VendorProductVersions
rabbitmq rabbitmq-java-client < 5.34.0

Weakness: CWE-770 · 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