CVE-2026-77403

High

Description

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.

SeverityHigh

CVSS8.9

Exploit probability—

ProductGithub.com/rabbitmq/amqp091-go

PublishedSep 16, 2026

First seenSep 16, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

github.com/rabbitmq/amqp091-go1.13.0 or later

Affected products

Product	Affected versions	Fixed in
github.com/rabbitmq/amqp091-goGo	v < 1.13.0	1.13.0

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