RabbitMQ Java client ValueReader: Oversized LongString/bytes length triggers OOM via unchecked allocation
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-789.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| rabbitmq | rabbitmq-java-client | before 5.33.1 | 5.33.1 | Patch available | CNA |
| — | com.rabbitmq:amqp-client (Maven) | before 5.33.1 | 5.33.1 | Patch available | GHSA-68mj-5wr7-6fgg |
- rabbitmq-java-client Vendorrabbitmq Affected before 5.33.1 Fixed in 5.33.1 Patch available CNA
- com.rabbitmq:amqp-client (Maven) Vendor— Affected before 5.33.1 Fixed in 5.33.1 Patch available GHSA-68mj-5wr7-6fgg
Remediation
- Fix · CNA rabbitmq-java-client (rabbitmq) Fixed in 5.33.1
- Fix · GHSA-68mj-5wr7-6fgg com.rabbitmq:amqp-client (Maven) Fixed in 5.33.1 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 2 products
- Red Hat Fuse 7
- Red Hat build of Apache Camel 4 for Quarkus 3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-69219
- 2026-10-03 Alias added: GHSA-68mj-5wr7-6fgg
References
Other 7
- https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-68mj-5wr7-6fgg
- https://github.com/rabbitmq/rabbitmq-java-client/pull/2007
- https://github.com/rabbitmq/rabbitmq-java-client/pull/2008
- https://github.com/rabbitmq/rabbitmq-java-client/commit/388209356c6478088efce4d8a07b68e73837a7a0
- https://github.com/rabbitmq/rabbitmq-java-client/commit/6a87a8dcdc8b4cc4b961a7cdd388276446e5dfb2
- https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.33.1
- https://github.com/rabbitmq/rabbitmq-java-client
More rabbitmq vulnerabilities
- TI-2026-41154 Improper authentication in rabbitmq-server CVSS 3.1CRITICAL 10.0
- TI-2026-41149 RabbitMQ: UNC SSRF affecting the management UI on Windows CVSS 3.1CRITICAL 10.0
- TI-2026-41158 Resource allocation without limits in rabbitmq-server CVSS 3.1HIGH 7.5
- TI-2026-47695 RabbitMQ: OAuth2 Client Secret Exposed via Unauthenticated JavaScript Endpoint CVSS 4.0HIGH 8.2
- TI-2026-47694 RabbitMQ: JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS CVSS 4.0HIGH 8.2
- TI-2026-45167 RabbitMQ Java client: Unvalidated Class.forName in JSON-RPC ProcedureDescription enables arbitrary class loading CVSS 4.0HIGH 7.5
Sources
- CVE-2026-69219 · CVE Program
- CVE-2026-69219 · NVD
- FIRST EPSS
- GHSA-68mj-5wr7-6fgg · GitHub Advisory Database · CC BY 4.0
- CVE-2026-69219 · Red Hat security data · CC BY 4.0
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