rabbitmq amqp091-go up to 1.12.x write.go writeShortstr integer overflow

Summaryinfo

A vulnerability identified as problematic has been detected in rabbitmq amqp091-go up to 1.12.x. This issue affects the function writeShortstr of the file write.go. Performing a manipulation results in integer overflow. This vulnerability is identified as CVE-2026-77408. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in rabbitmq amqp091-go up to 1.12.x. This affects the function writeShortstr of the file write.go. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on integrity, and availability. The summary by CVE is:

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, the writeShortstr function in write.go casts the byte length of AMQP shortstr property values to uint8 without first rejecting values longer than 255 bytes. An application that accepts an oversized CorrelationId, ReplyTo, MessageId, Expiration, UserId, AppId, ContentType, ContentEncoding, or Type value can therefore serialize a wrapped length and only a truncated prefix, while reporting no error. The resulting silent metadata corruption can break request and reply correlation, routing, tracing, and downstream message processing. This issue is fixed in version 1.13.0.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-77408 since 08/20/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available.

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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