RabbitMQ amqp091-go up to 1.12.x Connection Negotiation connection.go Connection.openTune allocation of resources

Summaryinfo

A vulnerability categorized as problematic has been discovered in RabbitMQ amqp091-go up to 1.12.x. Affected by this vulnerability is the function Connection.openTune of the file connection.go of the component Connection Negotiation. The manipulation results in allocation of resources. This vulnerability is identified as CVE-2026-77403. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in RabbitMQ amqp091-go up to 1.12.x. Affected is the function Connection.openTune of the file connection.go of the component Connection Negotiation. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Connection.openTune in connection.go accepts a server-advertised FrameMax below the AMQP frameMinSize value of 4096 bytes because the connection negotiation loop does not enforce the protocol minimum. A malicious or compromised AMQP broker can therefore advertise an extremely small FrameMax, causing later client publications to be fragmented into excessive numbers of frames and write operations. This can consume CPU and stall the client or its host. This issue is fixed in version 1.13.0.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-77403 since 08/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 1.13.0 eliminates this vulnerability.

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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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