CVE-2026-34582 — Botan has a TLS 1.3 certificate authentication bypass
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 rece…
Published: 2026-04-07 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7