CVE-2026-34582: CWE-841: Improper Enforcement of Behavioral Workflow in randombit botan
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.
AI Analysis
Technical Summary
CVE-2026-34582 describes a vulnerability in the Botan cryptography library's TLS 1.3 implementation before version 3.11.1. The vulnerability arises because ApplicationData records could be processed before the Finished handshake message, violating the expected TLS workflow. This allows a malicious client to bypass client certificate authentication by skipping Certificate, CertificateVerify, and Finished messages and sending application data prematurely. The issue is classified under CWE-841 (Improper Enforcement of Behavioral Workflow) and CWE-166 (Improper Initialization). The vulnerability has a CVSS 4.0 score of 8.7 (high severity). The vendor fixed this issue in Botan version 3.11.1.
Potential Impact
An attacker can bypass client authentication enforced by the server in TLS 1.3 sessions by omitting required handshake messages and sending application data early. This undermines the authentication guarantees of the TLS protocol, potentially allowing unauthorized access or communication without proper client verification.
Mitigation Recommendations
This vulnerability is fixed in Botan version 3.11.1. Users should upgrade to version 3.11.1 or later to remediate this issue. Patch status is confirmed by the vendor advisory. No additional mitigations are indicated.
CVE-2026-34582: CWE-841: Improper Enforcement of Behavioral Workflow in randombit botan
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.
CVSS v4.0
Score 8.7high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34582 describes a vulnerability in the Botan cryptography library's TLS 1.3 implementation before version 3.11.1. The vulnerability arises because ApplicationData records could be processed before the Finished handshake message, violating the expected TLS workflow. This allows a malicious client to bypass client certificate authentication by skipping Certificate, CertificateVerify, and Finished messages and sending application data prematurely. The issue is classified under CWE-841 (Improper Enforcement of Behavioral Workflow) and CWE-166 (Improper Initialization). The vulnerability has a CVSS 4.0 score of 8.7 (high severity). The vendor fixed this issue in Botan version 3.11.1.
Potential Impact
An attacker can bypass client authentication enforced by the server in TLS 1.3 sessions by omitting required handshake messages and sending application data early. This undermines the authentication guarantees of the TLS protocol, potentially allowing unauthorized access or communication without proper client verification.
Mitigation Recommendations
This vulnerability is fixed in Botan version 3.11.1. Users should upgrade to version 3.11.1 or later to remediate this issue. Patch status is confirmed by the vendor advisory. No additional mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-30T16:56:30.999Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-34582","vendor":"Red Hat"}]
Threat ID: 69d5779eaaed68159a6ad783
Added to database: 04/07/2026, 21:31:10 UTC
Last enriched: 07/15/2026, 09:03:15 UTC
Last updated: 07/31/2026, 19:32:31 UTC
Views: 139
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