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.

PUBLISHED Reserved 2026-03-30 | Published 2026-04-07 | Updated 2026-04-08 | Assigner GitHub_M

Problem types

CWE-841: Improper Enforcement of Behavioral Workflow

Product status

References

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

cve.org (CVE-2026-34582)

nvd.nist.gov (CVE-2026-34582)

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