CVE-2026-77403

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{"bugzilla": {"description": "github.com/rabbitmq/amqp091-go: RabbitMQ amqp091-go: Denial of Service via AMQP frame size negotiation", "id": "2535498", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535498"}, "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-839", "details": ["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.", "A flaw was found in RabbitMQ amqp091-go, a Go AMQP 0.9.1 client. A malicious or compromised AMQP broker can exploit this by advertising an extremely small frame size during connection negotiation. This can lead to excessive fragmentation of client publications, consuming significant CPU resources and potentially causing a Denial of Service (DoS) by stalling the client or its host."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, ensure that applications using the RabbitMQ amqp091-go client only connect to trusted AMQP brokers. Restrict network access for clients to only communicate with known, secure broker instances. This reduces the risk of a malicious or compromised broker exploiting the client's vulnerability during frame size negotiation."}, "name": "CVE-2026-77403", "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": "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": "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": "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": "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": "2026-09-16T14:36:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-77403\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-77403\nhttps://github.com/rabbitmq/amqp091-go/commit/2e0a919b89f337dbf58db2bb34ab206dac354a06\nhttps://github.com/rabbitmq/amqp091-go/pull/353\nhttps://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0\nhttps://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-xwwf-m8fg-p9q2"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.13.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "amqp091-go", "source": "cna", "vendor": "rabbitmq"}, "product": "amqp091-go", "vendor": "rabbitmq"}], "created": "2026-09-16T16:30:07.969690+00:00", "updated": "2026-09-18T02:30:06.421970+00:00", "vendors": ["rabbitmq", "rabbitmq$PRODUCT$amqp091-go"]}