GHSA-rm6m-hrcw-jw33: github.com/rabbitmq/amqp091-go (CVE-2026-77406)

Package	Ecosystem	Affected	Fixed in
github.com/rabbitmq/amqp091-go	Go	<1.13.0	1.13.0

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The amqp091-go Go package before 1.13.0 is affected. When a negative integer is passed to the Qos method's prefetchCount or prefetchSize parameters, it is cast to unsigned values, becoming 65535 or 4294967295, which can cause the broker to flood the consumer with messages and lead to memory exhaustion. An attacker who can change configuration or API inputs that set Qos values could trigger this denial of service. Upgrade to version 1.13.0 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.2	High	4.0	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	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0052, the 44th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:12 UTC First seen by agentprime
31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.