{"id":"CVE-2026-34582","summary":"Botan has a TLS 1.3 certificate authentication bypass","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.","aliases":["GHSA-pxcj-9ppx-g86g"],"modified":"2026-07-16T03:30:57.279597429Z","published":"2026-04-07T21:13:49.281Z","related":["openSUSE-SU-2026:20528-1"],"database_specific":{"cwe_ids":["CWE-841"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34582.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34582.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-34582"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34582.json"},{"type":"ADVISORY","url":"https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34582"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2456285"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/randombit/botan","events":[{"introduced":"51b06ca93d1998d19927699f78b8d67539148dde"},{"fixed":"86d105523def181ae833e3aaaf773b1b0c20dda4"}],"database_specific":{"cpe":"cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"3.11.1"},{"introduced":"3.0.0"},{"last_affected":"3.11.0"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["3.11.0","3.10.0","3.9.0","3.8.1","3.8.0","3.7.1","3.7.0","3.6.1","3.6.0","3.5.0","3.4.0","3.3.0","3.2.0","3.1.1","3.1.0","3.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/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"}]}