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.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86g	Vendor Advisory Mitigation

Configurations

Configuration 1 (hide)

cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*

History

17 Apr 2026, 20:31

Type	Values Removed	Values Added
First Time		Botan Project botan Botan Project
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.1
CPE		cpe:2.3:a:botan_project:botan::::::::
References	~~() https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86g -~~	() https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86g - Vendor Advisory, Mitigation

07 Apr 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-07 22:16

Updated : 2026-04-17 20:31

NVD link : CVE-2026-34582

Mitre link : CVE-2026-34582

CVE.ORG link : CVE-2026-34582

JSON object : View

Products Affected

botan_project

botan

CWE

CWE-841

Improper Enforcement of Behavioral Workflow

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