Vulnerability · Published Sep 16, 2026 · Assigned by GitHub_M

CVE-2026-77409RabbitMQ amqp091-go: Denial of Service via Synchronous Event Channel Blocking

High 8.2

In plain English

A high-severity resource allocation without limits in amqp091-go from rabbitmq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.5%top 55.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Channel.dispatch in channel.go, confirms.confirm in confirms.go, and Connection.dispatch0 in connection.go synchronously send publisher confirmations, flow-control events, consumer cancellations, returned messages, including NotifyConfirm events and connection block notifications, to application-provided channels. If a listener channel is unbuffered, full, or not drained promptly, the sole reader goroutine blocks and stops processing frames, acknowledgments, deliveries, and heartbeats. Broker-driven event bursts can therefore cause connection stalls, missed heartbeats, deadlocks, and disconnection. This issue is fixed in version 1.13.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	golang-github-rabbitmq-amqp091-go	no fix listed	DEBIAN-CVE-2026-77409
Debian:13	golang-github-rabbitmq-amqp091-go	no fix listed	DEBIAN-CVE-2026-77409
Debian:14	golang-github-rabbitmq-amqp091-go	1.14.0-1	DEBIAN-CVE-2026-77409
Ubuntu:24.04:LTS	golang-github-rabbitmq-amqp091-go	no fix listed	UBUNTU-CVE-2026-77409
Ubuntu:26.04:LTS	golang-github-rabbitmq-amqp091-go	no fix listed	UBUNTU-CVE-2026-77409
Ubuntu:26.10	golang-github-rabbitmq-amqp091-go	no fix listed	UBUNTU-CVE-2026-77409

Affected products (as reported)

Vendor	Product	Versions
rabbitmq	amqp091-go	< 1.13.0

Weakness: CWE-770 · Vector: 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

References

https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-wxx3-cj7g-w73j x_refsource_CONFIRM
https://github.com/rabbitmq/amqp091-go/pull/349 x_refsource_MISC
https://github.com/rabbitmq/amqp091-go/commit/5b0ccbb8d7bc3dfa18129d9b0f9256d656809494 x_refsource_MISC
https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0 x_refsource_MISC