CVE-2026-75516
RabbitMQ Java client: Frame-level OOM: Math.min(maxInboundMessageBodySize, 0) defeats frame size enforcement
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Timeline
ID reserved
By GitHub_M
- 30 days later
· 30 days later
Published
- 2 days later
· 2 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | High8.7 | 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 |
| NVDNVD · Awaiting Analysis | 4.0 | High8.7 | 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/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 |
- EPSS (exploitation in 30 days)
- 0.55% · top 54% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.7.
Weakness
Affected products
rabbitmq · rabbitmq-java-client
- affected < 5.34.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavencom.rabbitmq:amqp-clientGHSA-jh4v-gfqj-7rhx (opens in a new tab)
References (6)
- https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-jh4v-gfqj-7rhx (opens in a new tab)x_refsource_CONFIRM
- https://github.com/rabbitmq/rabbitmq-java-client/pull/2015 (opens in a new tab)x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-java-client/pull/2016 (opens in a new tab)x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-java-client/commit/6d7c2bfe89796ca34d3531098fb59dd657fea39e (opens in a new tab)x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-java-client/commit/e7f10bf99aee103dd9f64b3e52a725fc9f9d3763 (opens in a new tab)x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.34.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-jh4v-gfqj-7rhx (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-75516)Record last updated .