{
  "threat_severity" : "Important",
  "public_date" : "2026-03-26T18:59:38Z",
  "bugzilla" : {
    "description" : "path-to-regexp: path-to-regexp: Denial of Service via crafted regular expressions",
    "id" : "2451867",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2451867"
  },
  "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" : "verified"
  },
  "cwe" : "CWE-1333",
  "details" : [ "Impact:\nA bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service.\nPatches:\nFixed in version 8.4.0.\nWorkarounds:\nLimit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.", "A flaw was found in path-to-regexp. A remote attacker could exploit this vulnerability by providing specially crafted input that generates a regular expression with multiple sequential optional groups. This leads to an exponential growth in the generated regular expression, causing a Denial of Service (DoS) due to excessive resource consumption." ],
  "statement" : "This is an Important flaw in `path-to-regexp` that can lead to a Denial of Service. The vulnerability occurs when specially crafted input containing multiple sequential optional groups is used to generate regular expressions, causing exponential resource consumption.\nThe Red Hat Advanced Cluster Security is not affected by this issue since it's shipping a `path-to-regexp` version which doesn't contain the vulnerable code.",
  "affected_release" : [ {
    "product_name" : "Red Hat Ansible Automation Platform 2.6",
    "release_date" : "2026-05-04T00:00:00Z",
    "advisory" : "RHSA-2026:13545",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2.6::el9",
    "package" : "ansible-automation-platform-tech-preview/mcp-server-rhel9:1777386606"
  }, {
    "product_name" : "Red Hat Developer Hub 1.8",
    "release_date" : "2026-04-22T00:00:00Z",
    "advisory" : "RHSA-2026:9742",
    "cpe" : "cpe:/a:redhat:rhdh:1.8::el9",
    "package" : "rhdh/rhdh-hub-rhel9:1776784286"
  }, {
    "product_name" : "Red Hat Developer Hub 1.9",
    "release_date" : "2026-05-05T00:00:00Z",
    "advisory" : "RHSA-2026:13826",
    "cpe" : "cpe:/a:redhat:rhdh:1.9::el9",
    "package" : "rhdh/rhdh-hub-rhel9:1777903262"
  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces 3.27",
    "release_date" : "2026-04-23T00:00:00Z",
    "advisory" : "RHSA-2026:10175",
    "cpe" : "cpe:/a:redhat:openshift_devspaces:3.27::el9",
    "package" : "devspaces/code-rhel9:1776744110"
  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces 3.27",
    "release_date" : "2026-04-23T00:00:00Z",
    "advisory" : "RHSA-2026:10175",
    "cpe" : "cpe:/a:redhat:openshift_devspaces:3.27::el9",
    "package" : "devspaces/jetbrains-ide-rhel9:1776795400"
  }, {
    "product_name" : "Red Hat OpenShift distributed tracing 3.9.3",
    "release_date" : "2026-04-21T00:00:00Z",
    "advisory" : "RHSA-2026:9385",
    "cpe" : "cpe:/a:redhat:openshift_distributed_tracing:3.9::el9",
    "package" : "rhosdt/tempo-jaeger-query-rhel9:1776435608"
  }, {
    "product_name" : "Red Hat Trusted Artifact Signer 1.3",
    "release_date" : "2026-04-23T00:00:00Z",
    "advisory" : "RHSA-2026:10153",
    "cpe" : "cpe:/a:redhat:trusted_artifact_signer:1.3::el9",
    "package" : "rhtas/rhtas-console-ui-rhel9:1776673130"
  }, {
    "product_name" : "Red Hat Trusted Artifact Signer 1.3",
    "release_date" : "2026-04-23T00:00:00Z",
    "advisory" : "RHSA-2026:10172",
    "cpe" : "cpe:/a:redhat:trusted_artifact_signer:1.3::el9",
    "package" : "rhtas/rhtas-console-ui-rhel9:1776889929"
  } ],
  "package_state" : [ {
    "product_name" : "Cryostat 4",
    "fix_state" : "Affected",
    "package_name" : "cryostat/cryostat-openshift-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:cryostat:4"
  }, {
    "product_name" : "Cryostat 4",
    "fix_state" : "Not affected",
    "package_name" : "io.cryostat-cryostat",
    "cpe" : "cpe:/a:redhat:cryostat:4"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Will not fix",
    "package_name" : "openshift-logging/elasticsearch6-rhel9",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Will not fix",
    "package_name" : "openshift-logging/elasticsearch-operator-bundle",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Will not fix",
    "package_name" : "openshift-logging/elasticsearch-proxy-rhel9",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Will not fix",
    "package_name" : "openshift-logging/elasticsearch-rhel9-operator",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Will not fix",
    "package_name" : "openshift-logging/kibana6-rhel8",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Logging Subsystem for Red Hat OpenShift",
    "fix_state" : "Will not fix",
    "package_name" : "openshift-logging/logging-curator5-rhel9",
    "cpe" : "cpe:/a:redhat:logging:5"
  }, {
    "product_name" : "Migration Toolkit for Applications 8",
    "fix_state" : "Affected",
    "package_name" : "mta/mta-ui-rhel9",
    "cpe" : "cpe:/a:redhat:migration_toolkit_applications:8"
  }, {
    "product_name" : "Migration Toolkit for Virtualization",
    "fix_state" : "Affected",
    "package_name" : "migration-toolkit-virtualization/mtv-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:migration_toolkit_virtualization:2"
  }, {
    "product_name" : "Migration Toolkit for Virtualization",
    "fix_state" : "Will not fix",
    "package_name" : "mtv-candidate/mtv-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:migration_toolkit_virtualization:2"
  }, {
    "product_name" : "Multicluster Engine for Kubernetes",
    "fix_state" : "Affected",
    "package_name" : "multicluster-engine/console-mce-rhel9",
    "cpe" : "cpe:/a:redhat:multicluster_engine"
  }, {
    "product_name" : "Network Observability Operator",
    "fix_state" : "Not affected",
    "package_name" : "network-observability/network-observability-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:network_observ_optr:1"
  }, {
    "product_name" : "OpenShift Lightspeed",
    "fix_state" : "Not affected",
    "package_name" : "openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_lightspeed"
  }, {
    "product_name" : "OpenShift Lightspeed",
    "fix_state" : "Not affected",
    "package_name" : "openshift-lightspeed/lightspeed-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_lightspeed"
  }, {
    "product_name" : "OpenShift Pipelines",
    "fix_state" : "Will not fix",
    "package_name" : "openshift-pipelines/pipelines-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_pipelines:1"
  }, {
    "product_name" : "OpenShift Service Mesh 2",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/kiali-ossmc-rhel8",
    "cpe" : "cpe:/a:redhat:service_mesh:2"
  }, {
    "product_name" : "OpenShift Service Mesh 2",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/kiali-rhel8",
    "cpe" : "cpe:/a:redhat:service_mesh:2"
  }, {
    "product_name" : "OpenShift Service Mesh 3",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/kiali-operator-bundle",
    "cpe" : "cpe:/a:redhat:service_mesh:3"
  }, {
    "product_name" : "OpenShift Service Mesh 3",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/kiali-ossmc-rhel9",
    "cpe" : "cpe:/a:redhat:service_mesh:3"
  }, {
    "product_name" : "OpenShift Service Mesh 3",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/kiali-rhel9",
    "cpe" : "cpe:/a:redhat:service_mesh:3"
  }, {
    "product_name" : "OpenShift Service Mesh 3",
    "fix_state" : "Not affected",
    "package_name" : "openshift-service-mesh/kiali-rhel9-operator",
    "cpe" : "cpe:/a:redhat:service_mesh:3"
  }, {
    "product_name" : "Red Hat Advanced Cluster Management for Kubernetes 2",
    "fix_state" : "Affected",
    "package_name" : "rhacm2/console-rhel9",
    "cpe" : "cpe:/a:redhat:acm:2"
  }, {
    "product_name" : "Red Hat Advanced Cluster Security 4",
    "fix_state" : "Not affected",
    "package_name" : "advanced-cluster-security/rhacs-main-rhel8",
    "cpe" : "cpe:/a:redhat:advanced_cluster_security:4"
  }, {
    "product_name" : "Red Hat AMQ Broker 7",
    "fix_state" : "Will not fix",
    "package_name" : "amq7-tech-preview/amq-broker-jolokia-api-server-rhel9",
    "cpe" : "cpe:/a:redhat:amq_broker:7"
  }, {
    "product_name" : "Red Hat AMQ Broker 7",
    "fix_state" : "Not affected",
    "package_name" : "org.jolokia-jolokia-parent",
    "cpe" : "cpe:/a:redhat:amq_broker:7"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-26/gateway-rhel9",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Will not fix",
    "package_name" : "automation-controller",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Not affected",
    "package_name" : "automation-eda-controller",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "automation-gateway",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "automation-platform-ui",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat build of Apache Camel - HawtIO 4",
    "fix_state" : "Not affected",
    "package_name" : "io.hawt-project",
    "cpe" : "cpe:/a:redhat:apache_camel_hawtio:4"
  }, {
    "product_name" : "Red Hat build of Apicurio Registry 2",
    "fix_state" : "Not affected",
    "package_name" : "io.apicurio-apicurio-registry",
    "cpe" : "cpe:/a:redhat:service_registry:2"
  }, {
    "product_name" : "Red Hat Build of Podman Desktop",
    "fix_state" : "Affected",
    "package_name" : "podman-desktop-macos-1-0",
    "cpe" : "cpe:/a:redhat:podman_desktop:1"
  }, {
    "product_name" : "Red Hat Build of Podman Desktop",
    "fix_state" : "Affected",
    "package_name" : "podman-desktop-windows-1-0",
    "cpe" : "cpe:/a:redhat:podman_desktop:1"
  }, {
    "product_name" : "Red Hat Data Grid 8",
    "fix_state" : "Affected",
    "package_name" : "org.infinispan-infinispan-console",
    "cpe" : "cpe:/a:redhat:jboss_data_grid:8"
  }, {
    "product_name" : "Red Hat Developer Hub",
    "fix_state" : "Will not fix",
    "package_name" : "rhdh/backstage-community-plugin-catalog-backend-module-scaffolder-relation-processor",
    "cpe" : "cpe:/a:redhat:rhdh:1"
  }, {
    "product_name" : "Red Hat Edge Manager 1",
    "fix_state" : "Affected",
    "package_name" : "rhem/flightctl-ui-ocp-rhel9",
    "cpe" : "cpe:/a:redhat:edge_manager:1"
  }, {
    "product_name" : "Red Hat Edge Manager 1",
    "fix_state" : "Affected",
    "package_name" : "rhem/flightctl-ui-rhel9",
    "cpe" : "cpe:/a:redhat:edge_manager:1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "linux-sgx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "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" : "Affected",
    "package_name" : "gjs",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "linux-sgx",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "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 Fuse 7",
    "fix_state" : "Will not fix",
    "package_name" : "io.apicurio-apicurito",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Will not fix",
    "package_name" : "io.hawt-hawtio-online",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Will not fix",
    "package_name" : "io.hawt-project",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Will not fix",
    "package_name" : "io.syndesis-syndesis-parent",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 7",
    "fix_state" : "Not affected",
    "package_name" : "io.hawt-project",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 8",
    "fix_state" : "Not affected",
    "package_name" : "io.hawt-project",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:8"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "fix_state" : "Not affected",
    "package_name" : "io.hawt-project",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "fix_state" : "Not affected",
    "package_name" : "org.keycloak-keycloak-parent",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Affected",
    "package_name" : "rhoai/odh-data-science-pipelines-argo-argoexec-rhel8",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Affected",
    "package_name" : "rhoai/odh-data-science-pipelines-argo-workflowcontroller-rhel8",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-mlflow-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Affected",
    "package_name" : "rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Not affected",
    "package_name" : "openshift4/ose-agent-installer-ui-rhel9",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Not affected",
    "package_name" : "openshift4/ose-console",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Not affected",
    "package_name" : "openshift4/ose-console-rhel9",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Affected",
    "package_name" : "openshift4/ose-monitoring-plugin-rhel8",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Not affected",
    "package_name" : "openshift4/ose-monitoring-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat Openshift Data Foundation 4",
    "fix_state" : "Not affected",
    "package_name" : "odf4/mcg-core-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_data_foundation:4"
  }, {
    "product_name" : "Red Hat Openshift Data Foundation 4",
    "fix_state" : "Affected",
    "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" : "Not affected",
    "package_name" : "odf4/odf-console-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_data_foundation:4"
  }, {
    "product_name" : "Red Hat Openshift Data Foundation 4",
    "fix_state" : "Not affected",
    "package_name" : "odf4/odf-multicluster-console-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_data_foundation:4"
  }, {
    "product_name" : "Red Hat OpenShift GitOps",
    "fix_state" : "Affected",
    "package_name" : "openshift-gitops-1/argocd-rhel8",
    "cpe" : "cpe:/a:redhat:openshift_gitops:1"
  }, {
    "product_name" : "Red Hat OpenShift GitOps",
    "fix_state" : "Affected",
    "package_name" : "openshift-gitops-1/argocd-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_gitops:1"
  }, {
    "product_name" : "Red Hat OpenShift GitOps",
    "fix_state" : "Will not fix",
    "package_name" : "openshift-gitops-1/console-plugin-rhel8",
    "cpe" : "cpe:/a:redhat:openshift_gitops:1"
  }, {
    "product_name" : "Red Hat OpenShift Virtualization 4",
    "fix_state" : "Not affected",
    "package_name" : "container-native-virtualization/kubevirt-console-plugin",
    "cpe" : "cpe:/a:redhat:container_native_virtualization:4"
  }, {
    "product_name" : "Red Hat OpenShift Virtualization 4",
    "fix_state" : "Not affected",
    "package_name" : "container-native-virtualization/kubevirt-console-plugin-rhel9",
    "cpe" : "cpe:/a:redhat:container_native_virtualization:4"
  }, {
    "product_name" : "Red Hat Process Automation 7",
    "fix_state" : "Not affected",
    "package_name" : "org.kie-process-migration-service",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_bpms_platform:7"
  }, {
    "product_name" : "Red Hat Process Automation 7",
    "fix_state" : "Not affected",
    "package_name" : "org.uberfire-uberfire-parent",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_bpms_platform:7"
  }, {
    "product_name" : "Red Hat Quay 3",
    "fix_state" : "Not affected",
    "package_name" : "quay/quay-rhel8",
    "cpe" : "cpe:/a:redhat:quay:3"
  }, {
    "product_name" : "Red Hat Satellite 6",
    "fix_state" : "Affected",
    "package_name" : "nodejs-react-router",
    "cpe" : "cpe:/a:redhat:satellite:6"
  }, {
    "product_name" : "Red Hat Satellite 6",
    "fix_state" : "Affected",
    "package_name" : "nodejs-react-router-dom",
    "cpe" : "cpe:/a:redhat:satellite:6"
  }, {
    "product_name" : "Red Hat Single Sign-On 7",
    "fix_state" : "Will not fix",
    "package_name" : "org.keycloak-keycloak-parent",
    "cpe" : "cpe:/a:redhat:red_hat_single_sign_on:7"
  }, {
    "product_name" : "Red Hat Trusted Profile Analyzer",
    "fix_state" : "Not affected",
    "package_name" : "rhtpa/rhtpa-trustification-service-rhel9",
    "cpe" : "cpe:/a:redhat:trusted_profile_analyzer:2"
  }, {
    "product_name" : "Self-service automation portal 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform/automation-portal",
    "cpe" : "cpe:/a:redhat:ansible_portal:2"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-4926\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4926\nhttps://cna.openjsf.org/security-advisories.html" ],
  "name" : "CVE-2026-4926",
  "mitigation" : {
    "value" : "To mitigate this vulnerability, limit the use of multiple sequential optional groups in route patterns within applications that use `path-to-regexp`. Additionally, avoid directly passing user-controlled input as route patterns to prevent the generation of maliciously crafted regular expressions.",
    "lang" : "en:us"
  },
  "csaw" : false
}