{
  "threat_severity" : "Important",
  "public_date" : "2026-04-20T13:28:43Z",
  "bugzilla" : {
    "description" : "kafka: Apache Kafka: Authentication bypass via improper JWT validation",
    "id" : "2459739",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2459739"
  },
  "cvss3" : {
    "cvss3_base_score" : "8.6",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
    "status" : "draft"
  },
  "cwe" : "CWE-303",
  "details" : [ "A flaw was found in Apache Kafka. By default, the `sasl.oauthbearer.jwt.validator.class` property is set to `org.apache.kafka.common.security.oauthbearer.DefaultJwtValidator`, which does not validate JSON Web Token (JWT) signatures, issuers, or audiences. A remote attacker can exploit this by crafting a malicious JWT token with an arbitrary `preferred_username`, leading to an authentication bypass and unauthorized access to the Kafka broker." ],
  "package_state" : [ {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Not affected",
    "package_name" : "openshift-serverless-1/kn-ekb-dispatcher-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "OpenShift Serverless",
    "fix_state" : "Not affected",
    "package_name" : "openshift-serverless-1/kn-ekb-receiver-rhel9",
    "cpe" : "cpe:/a:redhat:serverless:1"
  }, {
    "product_name" : "Red Hat build of Apache Camel 4 for Quarkus 3",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "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" : "connect-api",
    "cpe" : "cpe:/a:redhat:camel_spring_boot:4"
  }, {
    "product_name" : "Red Hat build of Apache Camel for Spring Boot 4",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "cpe" : "cpe:/a:redhat:camel_spring_boot:4"
  }, {
    "product_name" : "Red Hat build of Apicurio Registry 2",
    "fix_state" : "Not affected",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:service_registry:2"
  }, {
    "product_name" : "Red Hat build of Apicurio Registry 3",
    "fix_state" : "Not affected",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:apicurio_registry:3"
  }, {
    "product_name" : "Red Hat build of Debezium 2",
    "fix_state" : "Not affected",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:debezium:2"
  }, {
    "product_name" : "Red Hat build of Debezium 3",
    "fix_state" : "Will not fix",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:debezium:3"
  }, {
    "product_name" : "Red Hat build of Quarkus",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "cpe" : "cpe:/a:redhat:quarkus:3"
  }, {
    "product_name" : "Red Hat Data Grid 8",
    "fix_state" : "Not affected",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:jboss_data_grid:8"
  }, {
    "product_name" : "Red Hat Data Grid 8",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "cpe" : "cpe:/a:redhat:jboss_data_grid:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "log4j:2/log4j",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "log4j",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Not affected",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 7",
    "fix_state" : "Not affected",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 7",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 8",
    "fix_state" : "Not affected",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:8"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 8",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "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" : "connect-api",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat Process Automation 7",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_bpms_platform:7"
  }, {
    "product_name" : "streams for Apache Kafka 2",
    "fix_state" : "Not affected",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:amq_streams:2"
  }, {
    "product_name" : "streams for Apache Kafka 2",
    "fix_state" : "Not affected",
    "package_name" : "kafka-clients",
    "cpe" : "cpe:/a:redhat:amq_streams:2"
  }, {
    "product_name" : "streams for Apache Kafka 3",
    "fix_state" : "Affected",
    "package_name" : "connect-api",
    "cpe" : "cpe:/a:redhat:amq_streams:3"
  }, {
    "product_name" : "streams for Apache Kafka 3",
    "fix_state" : "Affected",
    "package_name" : "kafka-clients",
    "cpe" : "cpe:/a:redhat:amq_streams:3"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-33557\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33557\nhttp://www.openwall.com/lists/oss-security/2026/04/17/2\nhttps://kafka.apache.org/cve-list\nhttps://lists.apache.org/thread/v57o00hm6yszdpdnvqx2ss4561yh953h" ],
  "name" : "CVE-2026-33557",
  "csaw" : false
}