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Vulnerability Details CVE-2026-34582

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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 9.8%

CVSS Severity

CVSS v3 Score 9.1

References

https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86g

Products affected by CVE-2026-34582

Botan Project » Botan » Version: 3.0.0

cpe:2.3:a:botan_project:botan:3.0.0
Botan Project » Botan » Version: 3.1.0

cpe:2.3:a:botan_project:botan:3.1.0
Botan Project » Botan » Version: 3.1.1

cpe:2.3:a:botan_project:botan:3.1.1
Botan Project » Botan » Version: 3.2.0

cpe:2.3:a:botan_project:botan:3.2.0
Botan Project » Botan » Version: 3.3.0

cpe:2.3:a:botan_project:botan:3.3.0
Botan Project » Botan » Version: 3.3.1

cpe:2.3:a:botan_project:botan:3.3.1
Botan Project » Botan » Version: 3.4.0

cpe:2.3:a:botan_project:botan:3.4.0
Botan Project » Botan » Version: 3.5.0

cpe:2.3:a:botan_project:botan:3.5.0
Botan Project » Botan » Version: 3.6.0

cpe:2.3:a:botan_project:botan:3.6.0
Botan Project » Botan » Version: 3.6.1

cpe:2.3:a:botan_project:botan:3.6.1
Botan Project » Botan » Version: 3.7.0

cpe:2.3:a:botan_project:botan:3.7.0

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-34582

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