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	Mitigation Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-34582
https://bugzilla.redhat.com/show_bug.cgi?id=2456285
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34582.json

Configurations

Configuration 1 (hide)

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

History

No history.

Information

Published : 2026-04-07 22:16

Updated : 2026-07-24 22:10

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

CWE-166

Improper Handling of Missing Special Element

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