CVE-2026-34582CRITICAL 9.1EPSS p9.6%
CVE-2026-34582CVE-2026-34582
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.
Scoring
| CVSS 3.1 | 9.1 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| EPSS | 0.20% probability of exploitation · percentile 9.6% · 2026-06-19T12:03:05Z |
| Published | 2026-04-07 |
| Last modified | 2026-04-17 |
Underlying weaknesses· 1
References
1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Improper Enforcement of Behavioral Workflowcwe-841 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.