RabbitMQ amqp091-go up to 1.12.x QoS channel.go Channel.Qos prefetchCount/prefetchSize integer overflow

Summaryinfo

A vulnerability labeled as problematic has been found in RabbitMQ amqp091-go up to 1.12.x. This affects the function Channel.Qos of the file channel.go of the component QoS. Such manipulation of the argument prefetchCount/prefetchSize leads to integer overflow. This vulnerability is listed as CVE-2026-77406. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in RabbitMQ amqp091-go up to 1.12.x and classified as problematic. Affected by this issue is the function Channel.Qos of the file channel.go of the component QoS. The manipulation of the argument prefetchCount/prefetchSize with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-77406 since 08/20/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available.

Upgrading to version 1.13.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-80808). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• RabbitMQ

Name

• amqp091-go

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12

Website

• Product: https://github.com/rabbitmq/amqp091-go/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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