CVE-2026-34582Botan is a C++ cryptography library.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 9.1 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-841, CWE-166
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
botan_project botan botan_project:botan | from 3.0.0 through 3.11.0 | NVD |
References
- https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86gmitigation, vendor-advisory
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.