CVE-2026-34582
CRITICALDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 14% of all known CVEs.
References
Related Vulnerabilities
Other CWE-841 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-1667 | High | 7.5 | 1.2% | - | Fix |
| CVE-2023-4181 | Medium | 5.4 | 1.1% | - | - |
| CVE-2022-2105 | Critical | 9.4 | 1.0% | - | Fix |
| CVE-2022-2102 | Critical | 9.4 | 0.9% | - | Fix |
| CVE-2024-51738 | High | 8.1 | 0.6% | - | Fix |
| CVE-2024-37296 | Medium | 5.3 | 0.5% | - | - |
Common questions
How do I fix CVE-2026-34582?
No published fix for CVE-2026-34582 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-34582 being actively exploited?
Not that we know of. CVE-2026-34582 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.23% is the estimated probability that it will be exploited in the next 30 days. That is higher than 14% of all scored CVEs.
How severe is CVE-2026-34582?
CVE-2026-34582 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-24.