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Fencer Vulns
high 8.2

CVE-2026-77409 json

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

published 2026-09-16 53 d ago modified 2026-09-24 45 d ago also EUVD-2026-80822

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

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 OpenStack Platform 18.0 rhoso-operators/rabbitmq-cluster-rhel9-operator 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 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
51 d ago

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.