{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77409", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-20T19:55:27.024Z", "datePublished": "2026-09-16T14:48:00.669Z", "dateUpdated": "2026-09-18T18:03:12.744Z"}, "containers": {"cna": {"title": "RabbitMQ amqp091-go: Denial of Service via Synchronous Event Channel Blocking", "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "LOW", "baseScore": 8.2, "baseSeverity": "HIGH", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-wxx3-cj7g-w73j", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-wxx3-cj7g-w73j"}, {"name": "https://github.com/rabbitmq/amqp091-go/pull/349", "tags": ["x_refsource_MISC"], "url": "https://github.com/rabbitmq/amqp091-go/pull/349"}, {"name": "https://github.com/rabbitmq/amqp091-go/commit/5b0ccbb8d7bc3dfa18129d9b0f9256d656809494", "tags": ["x_refsource_MISC"], "url": "https://github.com/rabbitmq/amqp091-go/commit/5b0ccbb8d7bc3dfa18129d9b0f9256d656809494"}, {"name": "https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0"}], "affected": [{"vendor": "rabbitmq", "product": "amqp091-go", "versions": [{"version": "< 1.13.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-16T14:48:00.669Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-wxx3-cj7g-w73j", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-18T18:02:58.536178Z", "id": "CVE-2026-77409", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-18T18:03:12.744Z"}}]}}

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{"bugzilla": {"description": "github.com/rabbitmq/amqp091-go: RabbitMQ amqp091-go: Denial of Service due to synchronous event channel blocking", "id": "2535494", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535494"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["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.", "A flaw was found in RabbitMQ amqp091-go, a Go AMQP 0.9.1 client. When the client synchronously sends events to application-provided channels, an unbuffered or full listener channel can cause the client's reader to block. This blockage prevents the processing of critical messages and heartbeats, leading to connection stalls, deadlocks, and disconnections. This vulnerability can result in a Denial of Service (DoS) for applications using the affected component."], "mitigation": {"lang": "en:us", "value": "Use adequately buffered notification channels and ensure event consumers continuously drain them. Update applications using amqp091-go when a fixed version is available."}, "name": "CVE-2026-77409", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Affected", "package_name": "cryostat/cryostat-storage-rhel9", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2", "fix_state": "Not affected", "package_name": "custom-metrics-autoscaler/custom-metrics-autoscaler-adapter-rhel9", "product_name": "Custom Metric Autoscaler operator for Red Hat Openshift"}, {"cpe": "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2", "fix_state": "Not affected", "package_name": "custom-metrics-autoscaler/custom-metrics-autoscaler-admission-webhooks-rhel9", "product_name": "Custom Metric Autoscaler operator for Red Hat Openshift"}, {"cpe": "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2", "fix_state": "Not affected", "package_name": "custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9", "product_name": "Custom Metric Autoscaler operator for Red Hat Openshift"}, {"cpe": "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2", "fix_state": "Affected", "package_name": "custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9-operator", "product_name": "Custom Metric Autoscaler operator for Red Hat Openshift"}, {"cpe": "cpe:/a:redhat:multicluster_globalhub", "fix_state": "Affected", "package_name": "multicluster-globalhub/multicluster-globalhub-grafana-rhel9", "product_name": "Multicluster Global Hub"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "package_name": "openshift-serverless-1/kn-plugin-event-sender-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Affected", "package_name": "rhacm2/acm-grafana-rhel9", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Affected", "package_name": "rhacm2/volsync-operator-bundle", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Affected", "package_name": "rhacm2/volsync-rhel9", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "opentelemetry-collector-contrib", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Affected", "package_name": "rhoso-operators/rabbitmq-cluster-rhel9-operator", "product_name": "Red Hat OpenStack Platform 18.0"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/clair-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/clair-rhel9", "product_name": "Red Hat Quay 3"}], "public_date": "2026-09-16T14:48:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-77409\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-77409\nhttps://github.com/rabbitmq/amqp091-go/commit/5b0ccbb8d7bc3dfa18129d9b0f9256d656809494\nhttps://github.com/rabbitmq/amqp091-go/pull/349\nhttps://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0\nhttps://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-wxx3-cj7g-w73j"], "statement": "This flaw has an Important impact because a broker-driven event burst can block AMQP client processing when application notification channels are unbuffered, full, or not promptly drained. The resulting stall can cause missed heartbeats, deadlocks, or client disconnection.", "threat_severity": "Important"}

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