CVE-2026-77406— RabbitMQ amqp091-go: Consumer Message Flooding via Signed-to-Unsigned Integer Casting in Qos Configuration
Quick assessment
Affected
rabbitmq amqp091-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
RabbitMQ 的 amqp091-go 是一个 Go 语言的 AMQP 0.9.1 客户端库。在 1.13.0 之前， 中的 方法会接受负的 和 整数值，并直接将其强制转换为 方法中的 和 字段，这是因为缺少 校验逻辑。因此，像 这样的值会被转换为 或 ，而不是被拒绝。如果应用允许对这些 Qos 值进行不受信任的配置，就可能意外地请求极大的预取（prefetch）限制，从而让消息代理（broker）投递足够多的排队消息，导致客户端内存耗尽并干扰正常处理流程。该问题已在 1.13.0 版本中修复。
Possible ATT&CK Techniques 2 AI
T1498 · Network Denial of Service T1027 · Obfuscated Files or InformationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| rabbitmq | amqp091-go | < 1.13.0 |
affected |
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I. Basic Information for CVE-2026-77406
Vulnerability Information
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Vulnerability Title
RabbitMQ amqp091-go: Consumer Message Flooding via Signed-to-Unsigned Integer Casting in Qos Configuration
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
有符号至无符号转换错误
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| rabbitmq | amqp091-go | < 1.13.0 | - |
|
II. Public POCs for CVE-2026-77406
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-77406 (2)
Vendor Advisories for CVE-2026-77406 (1)
Vendor Pages for CVE-2026-77406 (1)
Same Patch Batch · rabbitmq · 2026-09-16 · 11 CVEs total
| CVE-2026-77411 | 9.5 CRITICAL | RabbitMQ amqp091-go: Protocol Desynchronization and Frame Injection via Integer Overflow i |
| CVE-2026-77405 | 9.4 CRITICAL | RabbitMQ amqp091-go: Missing Explicit TLS Minimum Version Configuration In URI Parser |
| CVE-2026-77408 | 9.1 CRITICAL | RabbitMQ amqp091-go: Silent Data Truncation and State Corruption via Shortstr Integer Over |
| CVE-2026-77403 | 8.9 HIGH | RabbitMQ amqp091-go: Denial of Service via Sub-Spec Frame Size Negotiation |
| CVE-2026-77410 | 8.9 HIGH | RabbitMQ amqp091-go: Resource Exhaustion (OOM) via Unbounded Body Buffer Allocation |
| CVE-2026-77412 | 8.9 HIGH | RabbitMQ amqp091-go: Denial of Service via Malicious Field Length in AMQP Client |
| CVE-2026-77404 | 8.7 HIGH | RabbitMQ amqp091-go: Connection Configuration Overwrite via Unsanitized TLS Path Parameter |
| CVE-2026-75516 | 8.7 HIGH | RabbitMQ Java client: Frame-level OOM: Math.min(maxInboundMessageBodySize, 0) defeats fram |
| CVE-2026-77409 | 8.2 HIGH | RabbitMQ amqp091-go: Denial of Service via Synchronous Event Channel Blocking |
| CVE-2026-77407 | 7.0 HIGH | RabbitMQ amqp091-go: Plaintext Credential Exposure via Exported PLAIN Authentication Struc |
IV. Related Vulnerabilities
Same product: amqp091-go
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CVE-2026-77409
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CVE-2026-77411
RabbitMQ amqp091-go: Protocol Desynchronization and Frame In -
CVE-2026-77412
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CVE-2026-77405
RabbitMQ amqp091-go: Missing Explicit TLS Minimum Version Co -
CVE-2026-77404
RabbitMQ amqp091-go: Connection Configuration Overwrite via
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CVE-2026-77411
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Same weakness: CWE-195
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V. Comments for CVE-2026-77406
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