PT-2026-31028 · Randombit · Botan

Ben Smyth · Published 2026-04-07 · Updated 2026-04-07 · CVE-2026-34582

NVD

CVSS v4.0

8.7

High

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Weakness Enumeration

CWE-841

Related Identifiers

CVE-2026-34582

Affected Products

Botan

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-34582 · Security Note
• https://github.com/randombit/botan/security/advisories/GHSA-pxcj-9ppx-g86g · Note