VULNERABILITY INTELLIGENCE

CVE-2026-34582

CVSS score9.1 CRITICAL
EPSS probability0.23%
CISA KEVNot currently listed
Published2026-04-07
Last modified2026-07-24
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-841
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-166

Primary references