CVE-2026-77406

UNKNOWN 0.0

RabbitMQ amqp091-go: Consumer Message Flooding via Signed-to-Unsigned Integer Casting in Qos Configuration

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Channel.Qos in channel.go accepts negative prefetchCount and prefetchSize integers and casts them directly to uint16 and uint32 fields in the basic.qos method because validateQos is absent. Values such as -1 therefore wrap to 65535 or 4294967295 instead of being rejected. An application that permits untrusted configuration of these Qos values can unintentionally request extremely large prefetch limits, allowing a broker to deliver enough queued messages to exhaust client memory and disrupt processing. This issue is fixed in version 1.13.0.

CWE	CWE-195
Vendor	rabbitmq
Product	amqp091-go
Published	Sep 16, 2026

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Affected Versions

rabbitmq / amqp091-go

< 1.13.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-rm6m-hrcw-jw33 github.com: https://github.com/rabbitmq/amqp091-go/pull/351 github.com: https://github.com/rabbitmq/amqp091-go/commit/3b879e1d1d25b544e26b3bc3d7db3213203c0f3b github.com: https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0