critical9.1
CVE-2026-34582
Botan is a C++ cryptography library.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Botan Project | Botan | from 3.0.0 through 3.11.0 |