Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Botan Project | Botan | >= 3.0.0, <= 3.11.0 |
Related Weaknesses (CWE)
References
- https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86gVendor AdvisoryMitigation
FAQ
What is CVE-2026-34582?
CVE-2026-34582 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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...
How severe is CVE-2026-34582?
CVE-2026-34582 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-34582?
Check the references section above for vendor advisories and patch information. Affected products include: Botan Project Botan.