CVE-2026-77411 RabbitMQ amqp091-go: Protocol Desynchronization and Frame Injection via Integer Overflow in readLongstr
A malicious AMQP broker can cause protocol desynchronization and disrupt connection integrity in the amqp091-go library via an integer overflow in readLongstr.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-77411?
CVE-2026-77411 is a critical vulnerability in rabbitmq amqp091-go, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, readLongstr in read.go returns an empty string and a nil error when a declared AMQP longstr length exceeds 0x7FFFFFFF instead of returning ErrSyntax. The function leaves the declared field bytes unread, while readTable treats the operation as successful and continues parsing from the wrong offset. A malicious or compromised broker can provide an oversized longstr in a table field and desynchronize subsequent AMQP parsing, causing attacker-controlled trailing bytes to be interpreted as later fields or frames and disrupting connection integrity and availability. This issue is fixed in version 1.13.0.
Weakness: CWE-754
Which versions are affected by CVE-2026-77411?
3 open source packages ship an affected version, including github.com/rabbitmq/amqp091-go.
| Package | Affected | Fixed in |
|---|---|---|
github.com/rabbitmq/amqp091-go Go | All versions | 1.13.0 |
github.com/rabbitmq/amqp091-go Go | All versions | 1.13.0 |
github.com/rabbitmq/amqp091-go Go | All versions | 1.13.0 |
How do I fix CVE-2026-77411?
Upgrade github.com/rabbitmq/amqp091-go to 1.13.0 or later.
Is CVE-2026-77411 being exploited?
There is no known exploitation of CVE-2026-77411 in the wild and no public exploit code.
Sources
Also known as AZL-103206, AZL-103290, CLEANSTART-2026-DE21669, CLEANSTART-2026-VZ69242, CLEANSTART-2026-WU83692, DEBIAN-CVE-2026-77411 and 41 more.