Vulnerability · Published Aug 18, 2026 · Assigned by GitHub_M

CVE-2026-61634RabbitMQ Java client accepts broker frames larger than the negotiated AMQP frame_max

None 0.0

In plain English

A improper input validation 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 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)0.0None

Exploit odds (30 days)0.5%top 57.8% 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 5.33.0, the AMQP connection tuning path records the negotiated AMQP frame_max value, but src/main/java/com/rabbitmq/client/impl/SocketFrameHandler.java and NettyFrameHandlerFactory continue to validate broker-controlled frame payload lengths against maxInboundMessageBodySize because the negotiated limit is not applied consistently through setMaxInboundFramePayloadSize. A malicious or compromised broker can send a method frame larger than the negotiated frame_max during or after connection establishment, causing the client to allocate and decode a protocol-invalid frame instead of rejecting it with MalformedFrameException. The protocol violation can disrupt the affected connection and cause client-side denial of service. This issue is fixed in version 5.33.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	rabbitmq-java-client	no fix listed	DEBIAN-CVE-2026-61634
Debian:13	rabbitmq-java-client	no fix listed	DEBIAN-CVE-2026-61634
Maven	com.rabbitmq:amqp-client	5.33.0	GHSA-5xwg-cfvj-gff5
Ubuntu:22.04:LTS	rabbitmq-java-client	no fix listed	UBUNTU-CVE-2026-61634
Ubuntu:24.04:LTS	rabbitmq-java-client	no fix listed	UBUNTU-CVE-2026-61634
Ubuntu:26.04:LTS	rabbitmq-java-client	no fix listed	UBUNTU-CVE-2026-61634
Ubuntu:26.10	rabbitmq-java-client	no fix listed	UBUNTU-CVE-2026-61634

Affected products (as reported)

Vendor	Product	Versions
rabbitmq	rabbitmq-java-client	< 5.33.0

Weakness: CWE-20 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-5xwg-cfvj-gff5 x_refsource_CONFIRM
https://github.com/rabbitmq/rabbitmq-java-client/pull/1994 x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/pull/1995 x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/commit/08790f09686173eb17b48d08a25edcb32e71a591 x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/commit/b491075f42e89967610c40beded68d3680cfd472 x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.33.0 x_refsource_MISC