{"id":"UBUNTU-CVE-2026-5588","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).  This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java. This 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.","modified":"2026-05-20T22:02:00.447380366Z","published":"2026-04-15T10:16:00Z","upstream":["CVE-2026-5588"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5588"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-5588"},{"type":"REPORT","url":"https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588"}],"affected":[{"package":{"name":"bouncycastle","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.49+dfsg-3ubuntu1","1.51-4ubuntu1","1.51-4ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.51-4ubuntu1+esm1","binary_name":"libbcmail-java"},{"binary_version":"1.51-4ubuntu1+esm1","binary_name":"libbcpg-java"},{"binary_version":"1.51-4ubuntu1+esm1","binary_name":"libbcpkix-java"},{"binary_version":"1.51-4ubuntu1+esm1","binary_name":"libbcprov-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5588.json"}},{"package":{"name":"bouncycastle","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.57-1","1.58-1","1.59-1","1.59-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.59-1ubuntu0.1~esm1","binary_name":"libbcmail-java"},{"binary_version":"1.59-1ubuntu0.1~esm1","binary_name":"libbcpg-java"},{"binary_version":"1.59-1ubuntu0.1~esm1","binary_name":"libbcpkix-java"},{"binary_version":"1.59-1ubuntu0.1~esm1","binary_name":"libbcprov-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5588.json"}},{"package":{"name":"bouncycastle","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.61-1","1.61-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.61-1ubuntu0.1~esm1","binary_name":"libbcmail-java"},{"binary_version":"1.61-1ubuntu0.1~esm1","binary_name":"libbcpg-java"},{"binary_version":"1.61-1ubuntu0.1~esm1","binary_name":"libbcpkix-java"},{"binary_version":"1.61-1ubuntu0.1~esm1","binary_name":"libbcprov-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5588.json"}},{"package":{"name":"bouncycastle","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.68-2","1.68-4","1.68-5","1.68-5ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.68-5ubuntu0.1~esm1","binary_name":"libbcmail-java"},{"binary_version":"1.68-5ubuntu0.1~esm1","binary_name":"libbcpg-java"},{"binary_version":"1.68-5ubuntu0.1~esm1","binary_name":"libbcpkix-java"},{"binary_version":"1.68-5ubuntu0.1~esm1","binary_name":"libbcprov-java"},{"binary_version":"1.68-5ubuntu0.1~esm1","binary_name":"libbctls-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5588.json"}},{"package":{"name":"bouncycastle","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/bouncycastle?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.72-2","1.77-1","1.77-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.77-1ubuntu0.1~esm1","binary_name":"libbcjmail-java"},{"binary_version":"1.77-1ubuntu0.1~esm1","binary_name":"libbcmail-java"},{"binary_version":"1.77-1ubuntu0.1~esm1","binary_name":"libbcpg-java"},{"binary_version":"1.77-1ubuntu0.1~esm1","binary_name":"libbcpkix-java"},{"binary_version":"1.77-1ubuntu0.1~esm1","binary_name":"libbcprov-java"},{"binary_version":"1.77-1ubuntu0.1~esm1","binary_name":"libbctls-java"},{"binary_version":"1.77-1ubuntu0.1~esm1","binary_name":"libbcutil-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5588.json"}},{"package":{"name":"bouncycastle","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/bouncycastle?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.77-1","1.80-3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.80-3","binary_name":"libbcjmail-java"},{"binary_version":"1.80-3","binary_name":"libbcmail-java"},{"binary_version":"1.80-3","binary_name":"libbcpg-java"},{"binary_version":"1.80-3","binary_name":"libbcpkix-java"},{"binary_version":"1.80-3","binary_name":"libbcprov-java"},{"binary_version":"1.80-3","binary_name":"libbctls-java"},{"binary_version":"1.80-3","binary_name":"libbcutil-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5588.json"}},{"package":{"name":"bouncycastle","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/bouncycastle?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.80-3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.80-3","binary_name":"libbcjmail-java"},{"binary_version":"1.80-3","binary_name":"libbcmail-java"},{"binary_version":"1.80-3","binary_name":"libbcpg-java"},{"binary_version":"1.80-3","binary_name":"libbcpkix-java"},{"binary_version":"1.80-3","binary_name":"libbcprov-java"},{"binary_version":"1.80-3","binary_name":"libbctls-java"},{"binary_version":"1.80-3","binary_name":"libbcutil-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-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"},{"type":"Ubuntu","score":"medium"}]}