CVE-2026-34582
8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| randombit | botan | < 3.11.1 | affected |
Weaknesses
- CWE-841: CWE-841: Improper Enforcement of Behavioral Workflow
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
botan: Botan: Client authentication bypass in TLS 1.3 implementation
Additional References
- 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
References
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.