RabbitMQ amqp091-go: Consumer Message Flooding via Signed-to-Unsigned Integer Casting in Qos Configuration
Priority LOW 36CWE-195Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 4 fixed, 4 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Channel.Qos in channel.go accepts negative prefetchCount and prefetchSize integers and casts them directly to uint16 and uint32 fields in the basic.qos method because validateQos is absent. Values such as -1 therefore wrap to 65535 or 4294967295 instead of being rejected. An application that permits untrusted configuration of these Qos values can unintentionally request extremely large prefetch limits, allowing a broker to deliver enough queued messages to exhaust client memory and disrupt processing. This issue is fixed in version 1.13.0.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00524 44th percentileScored 2026-11-07
Fix Partial amqp091-go (rabbitmq): 1.13.0github.com/rabbitmq/amqp091-go (Go): 1.13.0Red Hat: 4 advisoriesRed Hat: 4 fixed, 4 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- 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 | amqp091-go | before 1.13.0 | 1.13.0 | Patch available | CNA |
| — | github.com/rabbitmq/amqp091-go (Go) | before 1.13.0 | 1.13.0 | Patch available | GHSA-rm6m-hrcw-jw33 |
- amqp091-go Vendorrabbitmq Affected before 1.13.0 Fixed in 1.13.0 Patch available CNA
- github.com/rabbitmq/amqp091-go (Go) Vendor— Affected before 1.13.0 Fixed in 1.13.0 Patch available GHSA-rm6m-hrcw-jw33
Remediation
- Fix · CNA amqp091-go (rabbitmq) Fixed in 1.13.0
- Fix · GHSA-rm6m-hrcw-jw33 github.com/rabbitmq/amqp091-go (Go) Fixed in 1.13.0 Advisory →
Red Hat 4 advisories
- RHSA-2026:79546 Released 2026-10-08 · Red Hat rating ImportantRed Hat Quay 3.12.23
- Red Hat Quay 3.12 registry.redhat.io/quay/quay-rhel8
- RHSA-2026:79366 Released 2026-10-08 · Red Hat rating ImportantRed Hat Quay 3.10.27
- Red Hat Quay 3.10 registry.redhat.io/quay/quay-rhel8
- RHSA-2026:77656 Released 2026-10-07 · Red Hat rating ImportantRed Hat Quay 3.9.27
- Red Hat Quay 3.9 registry.redhat.io/quay/quay-rhel8
Show 1 more Red Hat advisories
- RHSA-2026:68290 Released 2026-09-16 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images opentelemetry-collector-contrib-0.161.0-0.1.hum1@aarch64, opentelemetry-collector-contrib-0.161.0-0.1.hum1@src, opentelemetry-collector-contrib-0.161.0-0.1.hum1@x86_64
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Multicluster Global Hub | Affected | No fix yet |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
| Red Hat OpenStack Platform 18.0 | Affected | No fix yet |
| Red Hat Quay 3 | Affected | No fix yet |
| Red Hat Hardened Images | Fixed | RHSA-2026:68290 |
| Red Hat Quay 3.10 | Fixed | RHSA-2026:79366 |
| Red Hat Quay 3.12 | Fixed | RHSA-2026:79546 |
| Red Hat Quay 3.9 | Fixed | RHSA-2026:77656 |
Not affected: 7 products
- Cryostat 4
- Custom Metric Autoscaler operator for Red Hat Openshift
- OpenShift Serverless
- Red Hat Advanced Cluster Management for Kubernetes 2
- Red Hat Quay 3.10
- Red Hat Quay 3.12
- Red Hat Quay 3.9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-77406
- 2026-10-03 Alias added: GHSA-rm6m-hrcw-jw33
- 2026-10-07 Fix available: RHSA-2026:77656 · Red Hat
- 2026-10-08 Fix available: Red Hat Quay 3.9 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79546 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79366 · Red Hat
- 2026-10-09 Fix available: Red Hat Quay 3.10, Red Hat Quay 3.12 · Red Hat
- 2026-10-24 Affected versions changed · Red Hat
References
Other 5
- https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-rm6m-hrcw-jw33
- https://github.com/rabbitmq/amqp091-go/pull/351
- https://github.com/rabbitmq/amqp091-go/commit/3b879e1d1d25b544e26b3bc3d7db3213203c0f3b
- https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0
- https://github.com/rabbitmq/amqp091-go
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-2026-77406 · CVE Program
- CVE-2026-77406 · NVD
- FIRST EPSS
- GHSA-rm6m-hrcw-jw33 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-77406 · Red Hat security data · CC BY 4.0
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