{
  "threat_severity" : "Important",
  "public_date" : "2026-04-15T09:06:15Z",
  "bugzilla" : {
    "description" : "bouncycastle: BC-JAVA: PKIX draft CompositeVerifier accepts empty signature sequence as valid",
    "id" : "2458634",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2458634"
  },
  "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:H/A:N",
    "status" : "draft"
  },
  "cwe" : "CWE-347",
  "details" : [ "Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules). This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java.\nThis issue affects BC-JAVA: from 1.67 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11.", "A flaw was found in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix. The PKIX draft `CompositeVerifier` implementation improperly accepts an empty signature sequence as a valid cryptographic signature. This issue allows a remote attacker to bypass signature verification mechanisms, potentially compromising the authenticity and integrity of data." ],
  "statement" : "To exploit this issue, an attacker needs to submit a crafted payload or token containing an empty signature sequence to an application using the `CompositeVerifier` for cryptographic validation. An attack typically requires the application to process this malformed data and improperly accept the empty sequence as a valid signature, bypassing standard verification checks.\nThe primary impact of this vulnerability is the compromise of data authenticity and integrity, allowing an attacker to forge digital signatures and impersonate trusted entities.",
  "package_state" : [ {
    "product_name" : "Cryostat 4",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:cryostat:4"
  }, {
    "product_name" : "OpenShift Developer Tools and Services",
    "fix_state" : "Affected",
    "package_name" : "jenkins",
    "cpe" : "cpe:/a:redhat:ocp_tools"
  }, {
    "product_name" : "OpenShift Developer Tools and Services",
    "fix_state" : "Affected",
    "package_name" : "jenkins-2-plugins",
    "cpe" : "cpe:/a:redhat:ocp_tools"
  }, {
    "product_name" : "OpenShift Developer Tools and Services",
    "fix_state" : "Affected",
    "package_name" : "ocp-tools-4/jenkins-rhel8",
    "cpe" : "cpe:/a:redhat:ocp_tools"
  }, {
    "product_name" : "OpenShift Developer Tools and Services",
    "fix_state" : "Affected",
    "package_name" : "ocp-tools-4/jenkins-rhel9",
    "cpe" : "cpe:/a:redhat:ocp_tools"
  }, {
    "product_name" : "Red Hat AMQ Broker 7",
    "fix_state" : "Not affected",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:amq_broker:7"
  }, {
    "product_name" : "Red Hat AMQ Broker 7",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:amq_broker:7"
  }, {
    "product_name" : "Red Hat build of Apache Camel 4 for Quarkus 3",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:camel_quarkus:3"
  }, {
    "product_name" : "Red Hat build of Apache Camel for Spring Boot 4",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:camel_spring_boot:4"
  }, {
    "product_name" : "Red Hat build of Apache Camel for Spring Boot 4",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:camel_spring_boot:4"
  }, {
    "product_name" : "Red Hat build of Apicurio Registry 3",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:apicurio_registry:3"
  }, {
    "product_name" : "Red Hat build of Debezium 3",
    "fix_state" : "Will not fix",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:debezium:3"
  }, {
    "product_name" : "Red Hat build of Quarkus",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:quarkus:3"
  }, {
    "product_name" : "Red Hat Data Grid 8",
    "fix_state" : "Not affected",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:jboss_data_grid:8"
  }, {
    "product_name" : "Red Hat Data Grid 8",
    "fix_state" : "Not affected",
    "package_name" : "bcpkix-jdk15to18",
    "cpe" : "cpe:/a:redhat:jboss_data_grid:8"
  }, {
    "product_name" : "Red Hat Data Grid 8",
    "fix_state" : "Not affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:jboss_data_grid:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "pki-core:10.6/resteasy",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "pki-deps:10.6/resteasy",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "resteasy",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Will not fix",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Will not fix",
    "package_name" : "bcpkix-jdk15to18",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat Fuse 7",
    "fix_state" : "Will not fix",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:jboss_fuse:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 7",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 7",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:7"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 8",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-fips",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:8"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 8",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:8"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 8",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk15to18",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:8"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform 8",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "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" : "bcpkix-fips",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "fix_state" : "Not affected",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "fix_state" : "Not affected",
    "package_name" : "bcpkix-jdk15to18",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "fix_state" : "Not affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "fix_state" : "Not affected",
    "package_name" : "bcpkix-jdk18on-1.83.0.redhat-00001.jar",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat OpenShift AI (RHOAI)",
    "fix_state" : "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 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 Process Automation 7",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:jboss_enterprise_bpms_platform:7"
  }, {
    "product_name" : "Red Hat Process Automation 7",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk15to18",
    "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" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:red_hat_single_sign_on:7"
  }, {
    "product_name" : "streams for Apache Kafka 2",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:amq_streams:2"
  }, {
    "product_name" : "streams for Apache Kafka 2",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:amq_streams:2"
  }, {
    "product_name" : "streams for Apache Kafka 3",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk15on",
    "cpe" : "cpe:/a:redhat:amq_streams:3"
  }, {
    "product_name" : "streams for Apache Kafka 3",
    "fix_state" : "Affected",
    "package_name" : "bcpkix-jdk18on",
    "cpe" : "cpe:/a:redhat:amq_streams:3"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-5588\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-5588\nhttps://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588" ],
  "name" : "CVE-2026-5588",
  "mitigation" : {
    "value" : "To mitigate this flaw, check that the signature sequence is not empty before passing any data to the CompositeVerifier for cryptographic validation. If the sequence is empty or null, explicitly reject the payload before it is processed.",
    "lang" : "en:us"
  },
  "csaw" : false
}