High 8.2Published Sep 16, 2026

CVE-2026-77406RabbitMQ amqp091-go: Consumer Message Flooding via Signed-to-Unsigned Integer Casting in Qos Configuration

Updated under an hour ago (2026-10-19 09:10 UTC)

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It affects rabbitmq amqp091-go. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for rabbitmq amqp091-go

Exploited in the last 30 days

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.

CVSS: 8.2 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-195
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Sep 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

rabbitmq amqp091-go rabbitmq:amqp091_go (from the name)	before 1.13.0	CNA record

References

https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-rm6m-hrcw-jw33x-refsource-confirm
https://github.com/rabbitmq/amqp091-go/pull/351x-refsource-misc
https://github.com/rabbitmq/amqp091-go/commit/3b879e1d1d25b544e26b3bc3d7db3213203c0f3bx-refsource-misc
https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.