{"id":"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.","aliases":["GHSA-wg6q-6289-32hp"],"modified":"2026-05-20T04:03:10.647574552Z","published":"2026-04-15T09:06:15.617Z","related":["CGA-x825-vhrp-px34","SUSE-SU-2026:1639-1","SUSE-SU-2026:21404-1","openSUSE-SU-2026:10571-1","openSUSE-SU-2026:20627-1"],"database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"1.67"},{"fixed":"1.80.2"},{"introduced":"1.81"},{"fixed":"1.81.1"},{"introduced":"2.0.6"},{"fixed":"2.0.11"},{"introduced":"2.1.7"},{"fixed":"2.1.11"},{"introduced":"2.73.7"},{"fixed":"2.73.11"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"bcorg","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5588.json","cwe_ids":["CWE-327"]},"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://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://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":"FIX","url":"https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057"},{"type":"PACKAGE","url":"https://github.com/bcgit/bc-java"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bcgit/bc-java","events":[{"introduced":"de42702b6cda2631e8e3ff94f8458198860b328e"},{"fixed":"d716d7716a452bad283323aefd88ff21eba8deef"}]}],"versions":["r1rv83","r1rv82"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-5588.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber"}]}