CVE-2026-77403

Name	CVE-2026-77403
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-github-rabbitmq-amqp091-go (PTS)	bookworm	1.5.0-2	vulnerable
	trixie	1.10.0-1	vulnerable
	forky, sid	1.15.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
golang-github-rabbitmq-amqp091-go	source	(unstable)	1.14.0-1

Notes

[trixie] - golang-github-rabbitmq-amqp091-go <no-dsa> (Minor issue)
[bookworm] - golang-github-rabbitmq-amqp091-go <postponed> (Limited support, minor issue)
https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-xwwf-m8fg-p9q2
https://github.com/rabbitmq/amqp091-go/pull/353
https://github.com/rabbitmq/amqp091-go/commit/2e0a919b89f337dbf58db2bb34ab206dac354a06 (v1.13.0)