Critical severity9.1NVD Advisory· Published Apr 7, 2026· Updated Apr 17, 2026
CVE-2026-34582
CVE-2026-34582
Description
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.
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Affected products
3cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*range: >=3.0.0,<=3.11.0
- (no CPE)range: <3.11.1
Patches
Vulnerability mechanics
References
1- github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86gnvdVendor AdvisoryMitigation
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