botan3: Botan is a C++ cryptography library
CVE-2026-34582 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-34582, released April 7, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| Botan · opensuse-leap 16.0 | 3.7.1-160000.3.1 | OPENSUSE-SU-2026:20528-1 | Apr 14, 2026 |
| botan3 · Debian 13.5 (trixie) | 3.11.0+dfsg-2 | DEBIAN-CVE-2026-34582 | Apr 7, 2026 |
| botan3 · Debian 14 | 3.11.0+dfsg-2 | DEBIAN-CVE-2026-34582 | Apr 7, 2026 |
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