{
  "threat_severity" : "Important",
  "public_date" : "2026-05-13T18:09:19Z",
  "bugzilla" : {
    "description" : "netty: io.netty/netty-codec-compression: io.netty/netty-codec: Netty: Denial of Service via excessive memory allocation in LZ4FrameDecoder",
    "id" : "2477219",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2477219"
  },
  "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-770",
  "details" : [ "Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.", "A flaw was found in Netty, an asynchronous, event-driven network application framework. A remote attacker can exploit this vulnerability by sending a specially crafted LZ4 compressed data stream. This can cause the Lz4FrameDecoder to allocate a large amount of memory (up to 32 MB per block) before the LZ4 decompression runs, leading to excessive memory consumption and a denial of service (DoS) for the affected application." ],
  "statement" : "A flaw was found in Netty's LZ4FrameDecoder. The decoder allocates a buffer based on the decompressed length from the LZ4 frame header (up to 32 MB per block) before decompression runs. A remote attacker can send a small crafted LZ4 header (as few as 22 bytes) to force excessive memory allocation, leading to a denial of service. Red Hat products that use Netty with LZ4 compression enabled are affected.",
  "affected_release" : [ {
    "product_name" : "Red Hat Data Grid 8.6.2",
    "release_date" : "2026-07-20T00:00:00Z",
    "advisory" : "RHSA-2026:41951",
    "cpe" : "cpe:/a:redhat:jboss_data_grid:8",
    "package" : "netty-codec"
  }, {
    "product_name" : "Red Hat Data Grid 8.6.2",
    "release_date" : "2026-07-20T00:00:00Z",
    "advisory" : "RHSA-2026:41951",
    "cpe" : "cpe:/a:redhat:jboss_data_grid:8",
    "package" : "netty-codec-compression"
  }, {
    "product_name" : "Streams for Apache Kafka 2.9.4",
    "release_date" : "2026-07-02T00:00:00Z",
    "advisory" : "RHSA-2026:34608",
    "cpe" : "cpe:/a:redhat:amq_streams:2.9::el9"
  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces 3.29",
    "release_date" : "2026-07-08T00:00:00Z",
    "advisory" : "RHSA-2026:36820",
    "cpe" : "cpe:/a:redhat:openshift_devspaces:3.29::el9",
    "package" : "devspaces/multicluster-redirector-rhel9:1782989027"
  } ],
  "package_state" : [ {
    "product_name" : "Cryostat 4",
    "fix_state" : "Not affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:cryostat:4"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-ekb-dispatcher-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-ekb-receiver-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-eventing-integrations-aws-ddb-streams-source-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-eventing-integrations-aws-sqs-source-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Affected",
    "package_name" : "openshift-serverless-1/kn-eventing-integrations-timer-source-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "Red Hat AMQ Broker 7",
    "fix_state" : "Affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:amq_broker:7"
  }, {
    "product_name" : "Red Hat AMQ Clients",
    "fix_state" : "Affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:amq_clients:2023"
  }, {
    "product_name" : "Red Hat build of Apache Camel 4 for Quarkus 3",
    "fix_state" : "Not affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:camel_quarkus:3"
  }, {
    "product_name" : "Red Hat build of Apache Camel for Spring Boot 4",
    "fix_state" : "Not affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:camel_spring_boot:4"
  }, {
    "product_name" : "Red Hat build of Apache Camel - HawtIO 4",
    "fix_state" : "Affected",
    "package_name" : "netty-codec-compression",
    "cpe" : "cpe:/a:redhat:apache_camel_hawtio:4"
  }, {
    "product_name" : "Red Hat build of Apicurio Registry 2",
    "fix_state" : "Will not fix",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:service_registry:2"
  }, {
    "product_name" : "Red Hat build of Apicurio Registry 3",
    "fix_state" : "Affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:apicurio_registry:3"
  }, {
    "product_name" : "Red Hat build of Debezium 3",
    "fix_state" : "Will not fix",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:debezium:3"
  }, {
    "product_name" : "Red Hat Build of Keycloak",
    "fix_state" : "Not affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:build_keycloak:"
  }, {
    "product_name" : "Red Hat Build of Keycloak",
    "fix_state" : "Will not fix",
    "package_name" : "rhbk/keycloak-rhel9",
    "cpe" : "cpe:/a:redhat:build_keycloak:"
  }, {
    "product_name" : "Red Hat Build of Keycloak",
    "fix_state" : "Will not fix",
    "package_name" : "rhbk/keycloak-rhel9-operator",
    "cpe" : "cpe:/a:redhat:build_keycloak:"
  }, {
    "product_name" : "Red Hat Build of Keycloak",
    "fix_state" : "Affected",
    "package_name" : "rhbk-openshift-rhel9/rhbk-openshift-rhel9",
    "cpe" : "cpe:/a:redhat:build_keycloak:"
  }, {
    "product_name" : "Red Hat Build of Keycloak",
    "fix_state" : "Affected",
    "package_name" : "rhbk-rhel9-operator/rhbk-rhel9-operator",
    "cpe" : "cpe:/a:redhat:build_keycloak:"
  }, {
    "product_name" : "Red Hat build of OptaPlanner 8",
    "fix_state" : "Affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:optaplanner:::el6"
  }, {
    "product_name" : "Red Hat build of Quarkus",
    "fix_state" : "Not affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:quarkus:3"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
    "fix_state" : "Not affected",
    "package_name" : "bazel6",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
    "fix_state" : "Not affected",
    "package_name" : "bazel7",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3"
  }, {
    "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3",
    "fix_state" : "Not affected",
    "package_name" : "bazel8",
    "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3"
  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Will not fix",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 7",
    "fix_state" : "Affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 8",
    "fix_state" : "Not affected",
    "package_name" : "netty-codec",
    "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" : "netty-codec",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "fix_state" : "Not affected",
    "package_name" : "netty-codec-compression",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat Offline Knowledge Portal",
    "fix_state" : "Not affected",
    "package_name" : "offline-knowledge-portal/rhokp-rhel9",
    "cpe" : "cpe:/a:redhat:offline_knowledge_portal:1"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-modelmesh-rhel8",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Affected",
    "package_name" : "rhoai/odh-modelmesh-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Affected",
    "package_name" : "rhoai/odh-openvino-model-server-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-spark-operator-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-th06-cpu-torch210-py312-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-th06-cpu-torch291-py312-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-th06-cuda130-torch210-py312-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-th06-cuda130-torch291-py312-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-th06-rocm64-torch291-py312-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Not affected",
    "package_name" : "rhoai/odh-trustyai-service-rhel8",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "Affected",
    "package_name" : "rhoai/odh-trustyai-service-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_ai"
  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces",
    "fix_state" : "Affected",
    "package_name" : "devspaces/openvsx-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_devspaces:3"
  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces",
    "fix_state" : "Affected",
    "package_name" : "devspaces/pluginregistry-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_devspaces:3"
  }, {
    "product_name" : "Red Hat OpenShift Dev Spaces",
    "fix_state" : "Affected",
    "package_name" : "devspaces/server-rhel9",
    "cpe" : "cpe:/a:redhat:openshift_devspaces:3"
  }, {
    "product_name" : "Red Hat Process Automation 7",
    "fix_state" : "Will not fix",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_bpms_platform:7"
  }, {
    "product_name" : "Red Hat Satellite 6",
    "fix_state" : "Not affected",
    "package_name" : "candlepin",
    "cpe" : "cpe:/a:redhat:satellite:6"
  }, {
    "product_name" : "Red Hat Satellite 6",
    "fix_state" : "Not affected",
    "package_name" : "satellite:el8/candlepin",
    "cpe" : "cpe:/a:redhat:satellite:6"
  }, {
    "product_name" : "Red Hat Single Sign-On 7",
    "fix_state" : "Will not fix",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:red_hat_single_sign_on:7"
  }, {
    "product_name" : "streams for Apache Kafka 2",
    "fix_state" : "Affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:amq_streams:2"
  }, {
    "product_name" : "streams for Apache Kafka 3",
    "fix_state" : "Affected",
    "package_name" : "netty-codec",
    "cpe" : "cpe:/a:redhat:amq_streams:3"
  }, {
    "product_name" : "streams for Apache Kafka 3",
    "fix_state" : "Affected",
    "package_name" : "netty-codec-compression",
    "cpe" : "cpe:/a:redhat:amq_streams:3"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-42583\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42583\nhttps://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6" ],
  "name" : "CVE-2026-42583",
  "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
}