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Fencer Intel
high 8.2

CVE-2026-77409 json

RabbitMQ amqp091-go: Denial of Service via Synchronous Event Channel Blocking

published 3mo ago modified last mo. also EUVD-2026-80822 , GHSA-wxx3-cj7g-w73j

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository rabbitmq/amqp091-go. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
8.2
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Channel.dispatch in channel.go, confirms.confirm in confirms.go, and Connection.dispatch0 in connection.go synchronously send publisher confirmations, flow-control events, consumer cancellations, returned messages, including NotifyConfirm events and connection block notifications, to application-provided channels. If a listener channel is unbuffered, full, or not drained promptly, the sole reader goroutine blocks and stops processing frames, acknowledgments, deliveries, and heartbeats. Broker-driven event bursts can therefore cause connection stalls, missed heartbeats, deadlocks, and disconnection. This issue is fixed in version 1.13.0.

Patch / fix

  • golang-github-rabbitmq-amqp091-go Debian 14 1.14.0-1

debian advisories DEBIAN-CVE-2026-77409

  • opentelemetry-collector-contrib hummingbird 1 0.161.0-0.1.hum1

red hat advisories RHSA-2026:68290

  • telegraf Azure Linux 3.0 1.31.0-34

azure linux advisories AZL-103281

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-77409 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-77409 updated cvss 7.5

github.com/rabbitmq/amqp091-go: RabbitMQ amqp091-go: Denial of Service due to synchronous event channel blocking

  • Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9 Red Hat Quay 3 quay/clair-rhel8, quay/clair-rhel9
    affected: workaround, no fix available “Use adequately buffered notification channels and ensure event consumers continuously drain them. Update applications using amqp091-go when a fixed version is available.”
  • Red Hat Hardened Images opentelemetry-collector-contrib 0.161.0-0.1.hum1
    fixed: vendor fix “Use adequately buffered notification channels and ensure event consumers continuously drain them. Update applications using amqp091-go when a fixed version is available.” RHSA-2026:68290
  • Red Hat Quay 3.9 quay/quay-rhel8 1790808443
    fixed: vendor fix “Use adequately buffered notification channels and ensure event consumers continuously drain them. Update applications using amqp091-go when a fixed version is available.” RHSA-2026:77656
  • Red Hat Quay 3.10 quay/quay-rhel8 1791462428
    fixed: vendor fix “Use adequately buffered notification channels and ensure event consumers continuously drain them. Update applications using amqp091-go when a fixed version is available.” RHSA-2026:79366
  • Red Hat Quay 3.12 quay/quay-rhel8 1791314514
    fixed: vendor fix “Use adequately buffered notification channels and ensure event consumers continuously drain them. Update applications using amqp091-go when a fixed version is available.” RHSA-2026:79546
  • Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9
    not affected: component not present
  • Red Hat Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9, custom-metrics-autoscaler/custom-metrics-autoscaler-adapter-rhel9, custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator, custom-metrics-autoscaler/custom-metrics-autoscaler-admission-webhooks-rhel9
    not affected: vulnerable code not present
  • Red Hat OpenShift Serverless openshift-serverless-1/kn-plugin-event-sender-rhel9
    not affected: vulnerable code not in execute path
show 1 more
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/volsync-rhel9, rhacm2/volsync-operator-bundle Red Hat OpenStack Platform 18.0 rhoso-operators/rabbitmq-cluster-rhel9-operator Red Hat Quay 3.9 quay/clair-rhel8 1790697042, quay/quay-builder-rhel8 1790400755, quay/quay-operator-rhel8 1790399891, quay/quay-operator-bundle 1790903947, quay/quay-bridge-operator-rhel8 1790399899, quay/quay-bridge-operator-bundle 1790400430, +3 more Red Hat Quay 3.10 quay/clair-rhel8 1791318071, quay/quay-builder-rhel8 1791218455, quay/quay-operator-rhel8 1790399749, quay/quay-operator-bundle 1791465969, quay/quay-bridge-operator-rhel8 1790400341, quay/quay-bridge-operator-bundle 1790401388, +3 more Red Hat Quay 3.12 quay/clair-rhel8 1791318122, quay/quay-builder-rhel8 1791314224, quay/quay-operator-rhel8 1791435060, quay/quay-operator-bundle 1791436613, quay/quay-bridge-operator-rhel8 1791390151, quay/quay-bridge-operator-bundle 1791390652, +3 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 8.2 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 4.0 8.2 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • rabbitmq amqp091-go

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of rabbitmq/amqp091-go published their own advisory on GitHub. Reviewed sources take precedence over it.