{"id":"CVE-2026-5588","aliases":["GHSA-wg6q-6289-32hp"],"url":"https://o3.security/vulnerability/CVE-2026-5588","summary":"PKIX draft CompositeVerifier accepts empty signature sequence as valid.","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), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules).\n\n This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java.\n\n\n\nThis issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.","published":"2026-04-15T09:06:15.617Z","modified":"2026-09-20T14:24:15.888511Z","cvss":null,"epss":{"score":0.0064,"percentile":0.47297,"asOf":"2026-08-09"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.bouncycastle:bcpkix-jdk18on","fixedVersion":"1.84"},{"ecosystem":"Maven","name":"org.bouncycastle:bcpkix-jdk15to18","fixedVersion":"1.84"},{"ecosystem":"Maven","name":"org.bouncycastle:bcpkix-jdk15on","fixedVersion":"1.84"},{"ecosystem":"Maven","name":"org.bouncycastle:bcpkix-jdk14","fixedVersion":"1.84"},{"ecosystem":"Maven","name":"org.bouncycastle:bcpkix-debug-jdk18on","fixedVersion":"1.84"},{"ecosystem":"Maven","name":"org.bouncycastle:bcpkix-debug-jdk15to18","fixedVersion":"1.84"},{"ecosystem":"Maven","name":"org.bouncycastle:bcpkix-debug-jdk14","fixedVersion":"1.84"}],"fix":{"url":"https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057","label":"bcgit/bc-java@656bae0"},"references":[{"type":"WEB","url":"https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-fips/"},{"type":"WEB","url":"https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-lts8on/"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5588.json"},{"type":"WEB","url":"https://www.bouncycastle.org/download/bouncy-castle-java-fips/"},{"type":"WEB","url":"https://www.bouncycastle.org/download/bouncy-castle-java-lts/"},{"type":"WEB","url":"https://www.bouncycastle.org/download/bouncy-castle-java/"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11720"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11721"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13631"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14272"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14276"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:17668"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:18054"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:18055"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:18059"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21772"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:53644"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:53645"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:53646"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60239"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60246"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60247"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60248"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60249"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60250"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60251"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60252"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60254"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60256"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:60259"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:66488"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-5588"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5588.json"},{"type":"ADVISORY","url":"https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5588"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458634"},{"type":"FIX","url":"https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057"},{"type":"PACKAGE","url":"https://github.com/bcgit/bc-java"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-20T14:24:15.888511Z"}}