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: 2026-04-07
Score: 8.7 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
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History

Tue, 07 Apr 2026 21:30:00 +0000

Type Values Removed Values Added
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.
Title Botan has a TLS 1.3 certificate authentication bypass
Weaknesses CWE-841
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-07T21:13:49.281Z

Reserved: 2026-03-30T16:56:30.999Z

Link: CVE-2026-34582

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-07T22:16:22.810

Modified: 2026-04-07T22:16:22.810

Link: CVE-2026-34582

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses