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
Botan versions before 3.11.1 contain a vulnerability (CWE-841) in their TLS 1.3 implementation where ApplicationData records can be processed before the Finished handshake message is received. This allows a client to bypass client certificate authentication on servers enforcing it by skipping the Certificate, CertificateVerify, and Finished messages and sending application data prematurely. The vulnerability is addressed in Botan 3.11.1.
Potential Impact
An attacker can bypass client authentication mechanisms that rely on TLS client certificates by exploiting this flaw, potentially allowing unauthorized access or communication with a server that expects client authentication. This undermines the security guarantees of TLS client authentication in affected Botan versions.
Mitigation Recommendations
Upgrade to Botan version 3.11.1 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated in the available data. Patch status is not explicitly confirmed by a vendor advisory, but the fix is stated to be in version 3.11.1.
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Botan versions before 3.11.1 contain a vulnerability (CWE-841) in their TLS 1.3 implementation where ApplicationData records can be processed before the Finished handshake message is received. This allows a client to bypass client certificate authentication on servers enforcing it by skipping the Certificate, CertificateVerify, and Finished messages and sending application data prematurely. The vulnerability is addressed in Botan 3.11.1.
Potential Impact
An attacker can bypass client authentication mechanisms that rely on TLS client certificates by exploiting this flaw, potentially allowing unauthorized access or communication with a server that expects client authentication. This undermines the security guarantees of TLS client authentication in affected Botan versions.
Mitigation Recommendations
Upgrade to Botan version 3.11.1 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated in the available data. Patch status is not explicitly confirmed by a vendor advisory, but the fix is stated to be in version 3.11.1.
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
Threat ID: 69d5779eaaed68159a6ad783
Added to database: 4/7/2026, 9:31:10 PM
Last enriched: 4/7/2026, 9:46:12 PM
Last updated: 4/8/2026, 2:11:02 AM
Views: 8
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