CVE-2026-34582
9.1
CRITICAL
CVSS 3.1
EPSS 0.03%
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.
How to fix CVE-2026-34582
To remediate CVE-2026-34582, upgrade the affected package to a fixed version below.
- —upgrade to 3.11.1-r0 or later
- —no fix listed
- —no fix listed
Is CVE-2026-34582 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 3.11.1-r0
- from 0
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |