{"id":"UBUNTU-CVE-2026-34582","details":"Botan is a C++ cryptography library. Prior to version 3.11.1, the TLS 1.3 implementation allowed ApplicationData records to be processed prior to the Finished message being received. A server which is attempting to enforce client authentication via certificates can by bypassed by a client which entirely omits Certificate, CertificateVerify, and the Finished message and instead sends application data records. This vulnerability is fixed in 3.11.1.","modified":"2026-06-30T18:17:57.637971121Z","published":"2026-04-07T22:16:00Z","upstream":["CVE-2026-34582"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-34582"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-34582"},{"type":"REPORT","url":"https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86g"},{"type":"REPORT","url":"https://github.com/randombit/botan/pull/5599"}],"affected":[{"package":{"name":"botan","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/botan?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.0-3","2.4.0-4","2.4.0-5ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.0-5ubuntu1","binary_name":"botan"},{"binary_name":"libbotan-2-4","binary_version":"2.4.0-5ubuntu1"},{"binary_name":"python3-botan","binary_version":"2.4.0-5ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34582.json"}},{"package":{"name":"botan","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/botan?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.0-2","2.9.0-2build1","2.12.1-2","2.12.1-2build1"],"ecosystem_specific":{"binaries":[{"binary_name":"botan","binary_version":"2.12.1-2build1"},{"binary_version":"2.12.1-2build1","binary_name":"libbotan-2-12"},{"binary_version":"2.12.1-2build1","binary_name":"python3-botan"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34582.json"}},{"package":{"name":"botan","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/botan?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.17.3+dfsg-3","2.19.1+dfsg-2ubuntu1","2.19.1+dfsg-2ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"botan","binary_version":"2.19.1+dfsg-2ubuntu1+esm1"},{"binary_name":"libbotan-2-19","binary_version":"2.19.1+dfsg-2ubuntu1+esm1"},{"binary_name":"python3-botan","binary_version":"2.19.1+dfsg-2ubuntu1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34582.json"}},{"package":{"name":"botan","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/botan?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.19.3+dfsg-1ubuntu1","2.19.3+dfsg-1ubuntu2","2.19.3+dfsg-1ubuntu2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"botan","binary_version":"2.19.3+dfsg-1ubuntu2+esm1"},{"binary_name":"libbotan-2-19","binary_version":"2.19.3+dfsg-1ubuntu2+esm1"},{"binary_name":"python3-botan","binary_version":"2.19.3+dfsg-1ubuntu2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34582.json"}},{"package":{"name":"botan","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/botan?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.19.5+dfsg-4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.19.5+dfsg-4","binary_name":"libbotan-2-19"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34582.json"}},{"package":{"name":"botan3","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/botan3?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.7.1+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_version":"3.7.1+dfsg-2","binary_name":"botan"},{"binary_version":"3.7.1+dfsg-2","binary_name":"libbotan-3-7"},{"binary_version":"3.7.1+dfsg-2","binary_name":"python3-botan"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34582.json"}},{"package":{"name":"botan3","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/botan3?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.7.1+dfsg-2","3.10.0+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_name":"botan","binary_version":"3.10.0+dfsg-2"},{"binary_name":"libbotan-3-10","binary_version":"3.10.0+dfsg-2"},{"binary_name":"python3-botan","binary_version":"3.10.0+dfsg-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34582.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}