{
  "threat_severity" : "Important",
  "public_date" : "2026-04-24T08:00:47Z",
  "bugzilla" : {
    "description" : "grafana/tempo: Tempo: Denial of Service via large queries",
    "id" : "2461395",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2461395"
  },
  "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" : [ "Tempo queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.\nMitigation can be done by setting max_result_limit in the search config, e.g. to 262144 (2^18).", "A flaw was found in Tempo. A remote attacker can exploit this vulnerability by sending large queries to the Tempo service. This can lead to excessive memory allocations, potentially causing a Denial of Service (DoS) by impacting the availability of the service." ],
  "package_state" : [ {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Not affected",
    "package_name" : "openshift-logging/lokistack-gateway-rhel9",
    "cpe" : "cpe:/a:redhat:logging:6"
  }, {
    "product_name" : "Multicluster Global Hub",
    "fix_state" : "Not affected",
    "package_name" : "multicluster-globalhub/multicluster-globalhub-grafana-rhel8",
    "cpe" : "cpe:/a:redhat:multicluster_globalhub"
  }, {
    "product_name" : "Multicluster Global Hub",
    "fix_state" : "Not affected",
    "package_name" : "multicluster-globalhub/multicluster-globalhub-grafana-rhel9",
    "cpe" : "cpe:/a:redhat:multicluster_globalhub"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Affected",
    "package_name" : "rhacm2/acm-grafana-rhel9",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Ceph Storage 5",
    "fix_state" : "Affected",
    "package_name" : "rhceph/rhceph-5-dashboard-rhel8",
    "cpe" : "cpe:/a:redhat:ceph_storage:5"
  }, {
    "product_name" : "Red Hat Ceph Storage 6",
    "fix_state" : "Affected",
    "package_name" : "rhceph/rhceph-6-dashboard-rhel9",
    "cpe" : "cpe:/a:redhat:ceph_storage:6"
  }, {
    "product_name" : "Red Hat Ceph Storage 9",
    "fix_state" : "Affected",
    "package_name" : "rhceph/grafana-rhel10",
    "cpe" : "cpe:/a:redhat:ceph_storage:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "grafana",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "grafana",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat OpenShift distributed tracing 3",
    "fix_state" : "Affected",
    "package_name" : "rhosdt/tempo-gateway-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_distributed_tracing:3"
  }, {
    "product_name" : "Red Hat OpenShift distributed tracing 3",
    "fix_state" : "Not affected",
    "package_name" : "rhosdt/tempo-query-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_distributed_tracing:3"
  }, {
    "product_name" : "Red Hat OpenShift distributed tracing 3",
    "fix_state" : "Not affected",
    "package_name" : "rhosdt/tempo-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_distributed_tracing:3"
  }, {
    "product_name" : "Red Hat OpenShift distributed tracing 3",
    "fix_state" : "Not affected",
    "package_name" : "rhosdt/tempo-rhel9-operator",
    "cpe" : "cpe:/a:redhat:openshift_distributed_tracing:3"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-21728\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-21728\nhttps://grafana.com/security/security-advisories/cve-2026-21728" ],
  "name" : "CVE-2026-21728",
  "csaw" : false
}