{
  "threat_severity" : "Moderate",
  "public_date" : "2026-06-22T14:59:14Z",
  "bugzilla" : {
    "description" : "js-yaml: js-yaml: Denial of Service via crafted YAML merge keys",
    "id" : "2491401",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2491401"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.3",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
    "status" : "verified"
  },
  "cwe" : "CWE-1333",
  "details" : [ "js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (<<) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.", "A flaw was found in js-yaml, a JavaScript YAML parser and dumper. A remote attacker can exploit this vulnerability by providing a specially crafted YAML document that repeatedly uses the same alias in a merge sequence. This can lead to algorithmic CPU exhaustion, causing the Node.js worker or event loop to be blocked for an extended period, resulting in a denial of service (DoS) for the affected system." ],
  "statement" : "Red Hat rates this flaw as Moderate impact, consistent with the upstream CVEORG assessment. The vulnerability causes CPU exhaustion via quadratic merge-key processing in js-yaml's YAML parser. In Red Hat products, all confirmed vulnerable code paths run client-side in the browser (OpenShift Console plugins, Kiali frontend, monitoring dashboard editors). A denial of service is limited to freezing the user's own browser tab when processing crafted YAML input, not server-side resource exhaustion. The user can recover by closing the tab.",
  "affected_release" : [ {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-06-30T00:00:00Z",
    "advisory" : "RHSA-2026:33866",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "nodejs26-main-26.4.0-1.3.hum1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-07-11T00:00:00Z",
    "advisory" : "RHSA-2026:38236",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "nodejs24-main-24.18.0-0.3.hum1"
  } ],
  "package_state" : [ {
    "product_name" : "Cryostat 4",
    "fix_state" : "Fix deferred",
    "package_name" : "cryostat/cryostat-openshift-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:cryostat:4"
  }, {
    "product_name" : "Cryostat 4",
    "fix_state" : "Fix deferred",
    "package_name" : "cryostat-openshift-console-plugin-npm",
    "cpe" : "cpe:/a:redhat:cryostat:4"
  }, {
    "product_name" : "Cryostat 4",
    "fix_state" : "Fix deferred",
    "package_name" : "grafana-infinity-datasource-npm",
    "cpe" : "cpe:/a:redhat:cryostat:4"
  }, {
    "product_name" : "Cryostat 4",
    "fix_state" : "Fix deferred",
    "package_name" : "js-yaml",
    "cpe" : "cpe:/a:redhat:cryostat:4"
  }, {
    "product_name" : "Gatekeeper 3",
    "fix_state" : "Not affected",
    "package_name" : "gatekeeper/gatekeeper-rhel9",
    "cpe" : "cpe:/a:redhat:gatekeeper:3"
  }, {
    "product_name" : "Migration Toolkit for Applications 8",
    "fix_state" : "Fix deferred",
    "package_name" : "mta/mta-ui-rhel8",
    "cpe" : "cpe:/a:redhat:migration_toolkit_applications:8"
  }, {
    "product_name" : "Migration Toolkit for Applications 8",
    "fix_state" : "Fix deferred",
    "package_name" : "mta/mta-ui-rhel9",
    "cpe" : "cpe:/a:redhat:migration_toolkit_applications:8"
  }, {
    "product_name" : "Migration Toolkit for Containers",
    "fix_state" : "Fix deferred",
    "package_name" : "rhmtc/openshift-migration-ui-rhel8",
    "cpe" : "cpe:/a:redhat:rhmt:1"
  }, {
    "product_name" : "Multicluster Engine for Kubernetes",
    "fix_state" : "Fix deferred",
    "package_name" : "multicluster-engine/console-mce-rhel9",
    "cpe" : "cpe:/a:redhat:multicluster_engine"
  }, {
    "product_name" : "Network Observability Operator",
    "fix_state" : "Fix deferred",
    "package_name" : "network-observability/network-observability-console-plugin-pf5-rhel9",
    "cpe" : "cpe:/a:redhat:network_observ_optr:1"
  }, {
    "product_name" : "Network Observability Operator",
    "fix_state" : "Fix deferred",
    "package_name" : "network-observability/network-observability-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:network_observ_optr:1"
  }, {
    "product_name" : "Node HealthCheck Operator",
    "fix_state" : "Fix deferred",
    "package_name" : "workload-availability/node-healthcheck-must-gather-rhel9",
    "cpe" : "cpe:/a:redhat:workload_availability_nhc:0"
  }, {
    "product_name" : "Node HealthCheck Operator",
    "fix_state" : "Fix deferred",
    "package_name" : "workload-availability/node-healthcheck-operator-bundle",
    "cpe" : "cpe:/a:redhat:workload_availability_nhc:0"
  }, {
    "product_name" : "Node HealthCheck Operator",
    "fix_state" : "Fix deferred",
    "package_name" : "workload-availability/node-healthcheck-rhel9-operator",
    "cpe" : "cpe:/a:redhat:workload_availability_nhc:0"
  }, {
    "product_name" : "Node HealthCheck Operator",
    "fix_state" : "Fix deferred",
    "package_name" : "workload-availability/node-remediation-console-rhel8",
    "cpe" : "cpe:/a:redhat:workload_availability_nhc:0"
  }, {
    "product_name" : "Node HealthCheck Operator",
    "fix_state" : "Fix deferred",
    "package_name" : "workload-availability/node-remediation-console-rhel9",
    "cpe" : "cpe:/a:redhat:workload_availability_nhc:0"
  }, {
    "product_name" : "OpenShift Lightspeed",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-lightspeed/lightspeed-console-plugin-419-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_lightspeed"
  }, {
    "product_name" : "OpenShift Lightspeed",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_lightspeed"
  }, {
    "product_name" : "OpenShift Lightspeed",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-lightspeed/lightspeed-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_lightspeed"
  }, {
    "product_name" : "OpenShift Pipelines",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-pipelines/pipelines-console-plugin-pf5-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_pipelines:1"
  }, {
    "product_name" : "OpenShift Pipelines",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-pipelines/pipelines-console-plugin-rhel8",
    "cpe" : "cpe:/a:redhat:openshift_pipelines:1"
  }, {
    "product_name" : "OpenShift Pipelines",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-pipelines/pipelines-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_pipelines:1"
  }, {
    "product_name" : "OpenShift Pipelines",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-pipelines/pipelines-hub-ui-rhel8",
    "cpe" : "cpe:/a:redhat:openshift_pipelines:1"
  }, {
    "product_name" : "OpenShift Pipelines",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-pipelines/pipelines-hub-ui-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_pipelines:1"
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    "product_name" : "OpenShift Service Mesh 2",
    "fix_state" : "Fix deferred",
    "package_name" : "openshift-service-mesh/kiali-ossmc-rhel8",
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    "product_name" : "OpenShift Service Mesh 2",
    "fix_state" : "Fix deferred",
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    "product_name" : "OpenShift Service Mesh 3",
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    "product_name" : "OpenShift Service Mesh 3",
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    "product_name" : "OpenShift Service Mesh 3",
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    "product_name" : "OpenShift Service Mesh 3",
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    "product_name" : "Red Hat Advanced Cluster Security 4",
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    "product_name" : "Red Hat Directory Server 11",
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    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "rust",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
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    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "grafana",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
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    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "mozjs60",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "pcs",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "gjs",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
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    "product_name" : "Red Hat Enterprise Linux 9",
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    "package_name" : "grafana",
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    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "pcs",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "rust",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
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    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
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    "fix_state" : "Will not fix",
    "package_name" : "rhelai3/disk-image-cuda-rhel9",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
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    "package_name" : "rust",
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  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Fix deferred",
    "package_name" : "js-yaml",
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  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Affected",
    "package_name" : "dotnet8.0",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Affected",
    "package_name" : "nodejs20",
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  }, {
    "product_name" : "Red Hat Hardened Images",
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    "package_name" : "nodejs22",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Affected",
    "package_name" : "nodejs25",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Affected",
    "package_name" : "rust",
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  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "yarnpkg",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 7",
    "fix_state" : "Fix deferred",
    "package_name" : "js-yaml",
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  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 8",
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    "package_name" : "js-yaml",
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    "product_name" : "Red Hat OpenShift AI (RHOAI)",
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    "cpe" : "cpe:/a:redhat:openshift_ai"
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    "product_name" : "Red Hat OpenShift AI (RHOAI)",
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    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
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    "package_name" : "rhoai/odh-mod-arch-eval-hub-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
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    "product_name" : "Red Hat OpenShift AI (RHOAI)",
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    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
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    "package_name" : "rhoai/odh-mod-arch-maas-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
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    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Affected",
    "package_name" : "rhoai/odh-mod-arch-model-registry-rhel9",
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  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Affected",
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  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
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    "product_name" : "Red Hat OpenShift Container Platform 4",
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  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
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    "package_name" : "openshift4/ose-console",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
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    "package_name" : "openshift4/ose-console-rhel9",
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    "product_name" : "Red Hat OpenShift Container Platform 4",
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  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
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  }, {
    "product_name" : "Red Hat Openshift Data Foundation 4",
    "fix_state" : "Fix deferred",
    "package_name" : "odf4/ocs-client-console-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_data_foundation:4"
  }, {
    "product_name" : "Red Hat Openshift Data Foundation 4",
    "fix_state" : "Fix deferred",
    "package_name" : "odf4/odf-console-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_data_foundation:4"
  }, {
    "product_name" : "Red Hat Openshift Data Foundation 4",
    "fix_state" : "Fix deferred",
    "package_name" : "odf4/odf-multicluster-console-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_data_foundation:4"
  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces",
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    "package_name" : "devspaces/code-rhel9",
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    "product_name" : "Red Hat OpenShift Dev Spaces",
    "fix_state" : "Fix deferred",
    "package_name" : "devspaces/dashboard-rhel9",
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  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces",
    "fix_state" : "Not affected",
    "package_name" : "devspaces/openvsx-rhel9",
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  }, {
    "product_name" : "Red Hat OpenShift GitOps",
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    "package_name" : "openshift-gitops-1/argocd-rhel8",
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    "product_name" : "Red Hat OpenShift GitOps",
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  }, {
    "product_name" : "Red Hat OpenShift Virtualization 4",
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    "package_name" : "container-native-virtualization/kubevirt-console-plugin",
    "cpe" : "cpe:/a:redhat:container_native_virtualization:4"
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    "product_name" : "Red Hat OpenShift Virtualization 4",
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    "package_name" : "container-native-virtualization/kubevirt-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:container_native_virtualization:4"
  }, {
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    "package_name" : "quay/quay-rhel8",
    "cpe" : "cpe:/a:redhat:quay:3"
  }, {
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    "package_name" : "quay/quay-rhel9",
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  }, {
    "product_name" : "Red Hat Satellite 6",
    "fix_state" : "Not affected",
    "package_name" : "satellite/iop-advisor-frontend-rhel9",
    "cpe" : "cpe:/a:redhat:satellite:6"
  }, {
    "product_name" : "Red Hat Satellite 6",
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    "package_name" : "satellite/iop-remediations-rhel9",
    "cpe" : "cpe:/a:redhat:satellite:6"
  }, {
    "product_name" : "Red Hat Single Sign-On 7",
    "fix_state" : "Fix deferred",
    "package_name" : "js-yaml",
    "cpe" : "cpe:/a:redhat:red_hat_single_sign_on:7"
  }, {
    "product_name" : "Red Hat Trusted Artifact Signer",
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    "package_name" : "rhtas/rekor-search-ui-rhel9",
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  }, {
    "product_name" : "Red Hat Trusted Artifact Signer",
    "fix_state" : "Fix deferred",
    "package_name" : "rhtas/rhtas-console-ui-rhel9",
    "cpe" : "cpe:/a:redhat:trusted_artifact_signer:1"
  }, {
    "product_name" : "Red Hat Trusted Profile Analyzer",
    "fix_state" : "Fix deferred",
    "package_name" : "rhtpa/rhtpa-trustification-service-rhel9",
    "cpe" : "cpe:/a:redhat:trusted_profile_analyzer:2"
  }, {
    "product_name" : "Self-service automation portal 2",
    "fix_state" : "Fix deferred",
    "package_name" : "ansible-automation-platform/automation-portal",
    "cpe" : "cpe:/a:redhat:ansible_portal:2"
  }, {
    "product_name" : "Self-service automation portal 2",
    "fix_state" : "Fix deferred",
    "package_name" : "ansible-automation-platform/bootc-automation-portal-rhel9",
    "cpe" : "cpe:/a:redhat:ansible_portal:2"
  }, {
    "product_name" : "streams for Apache Kafka 2",
    "fix_state" : "Fix deferred",
    "package_name" : "js-yaml",
    "cpe" : "cpe:/a:redhat:amq_streams:2"
  }, {
    "product_name" : "streams for Apache Kafka 3",
    "fix_state" : "Fix deferred",
    "package_name" : "js-yaml",
    "cpe" : "cpe:/a:redhat:amq_streams:3"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-53550\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53550\nhttps://github.com/nodeca/js-yaml/security/advisories/GHSA-h67p-54hq-rp68" ],
  "name" : "CVE-2026-53550",
  "mitigation" : {
    "value" : "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
    "lang" : "en:us"
  },
  "csaw" : false
}