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Fencer Vulns
high 8.9

CVE-2026-77403 json

RabbitMQ amqp091-go: Denial of Service via Sub-Spec Frame Size Negotiation

published 2026-09-16 53 d ago modified 2026-10-01 38 d ago also GHSA-xwwf-m8fg-p9q2 , GO-2026-6503 , EUVD-2026-80807

cvss
8.9
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, Connection.openTune in connection.go accepts a server-advertised FrameMax below the AMQP frameMinSize value of 4096 bytes because the connection negotiation loop does not enforce the protocol minimum. A malicious or compromised AMQP broker can therefore advertise an extremely small FrameMax, causing later client publications to be fragmented into excessive numbers of frames and write operations. This can consume CPU and stall the client or its host. This issue is fixed in version 1.13.0.

Patch / fix

  • go github.com/rabbitmq/amqp091-go 1.13.0
  • golang-github-rabbitmq-amqp091-go Debian 14 1.14.0-1

debian advisories DEBIAN-CVE-2026-77403

  • 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-103296

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-2026-77403 updated cvss 7.5

github.com/rabbitmq/amqp091-go: RabbitMQ amqp091-go: Denial of Service via AMQP frame size negotiation

  • 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 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
  • Red Hat Hardened Images opentelemetry-collector-contrib 0.161.0-0.1.hum1
    fixed: vendor fix RHSA-2026:68290
  • Red Hat Quay 3.9 quay/quay-rhel8 1790808443
    fixed: vendor fix RHSA-2026:77656
  • Red Hat Quay 3.10 quay/quay-rhel8 1791462428
    fixed: vendor fix RHSA-2026:79366
  • Red Hat Quay 3.12 quay/quay-rhel8 1791314514
    fixed: vendor fix 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-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
no
Technical impact
partial
Assessed
53 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 8.9 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
CNA 4.0 8.9 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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 packages

ecosystem package affected fixed in
go github.com/rabbitmq/amqp091-go
<1.13.0
1.13.0

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.