PT-2026-26321 · Wolfssl · Wolfssl

Kai Tian · Published 2026-03-19 · Updated 2026-03-19 · CVE-2026-2645

NVD

CVSS v4.0

5.4

Medium

AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/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

In wolfSSL 5.8.2 and earlier, a logic flaw existed in the TLS 1.2 server state machine implementation. The server could incorrectly accept the CertificateVerify message before the ClientKeyExchange message had been received. This issue affects wolfSSL before 5.8.4 (wolfSSL 5.8.2 and earlier is vulnerable, 5.8.4 is not vulnerable). In 5.8.4 wolfSSL would detect the issue later in the handshake. 5.9.0 was further hardened to catch the issue earlier in the handshake.

Fix

Improperly Implemented Security Check for Standard

Weakness Enumeration

CWE-358

Related Identifiers

CVE-2026-2645

Affected Products

Wolfssl

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-2645 · Security Note
• https://github.com/wolfSSL/wolfssl/pull/9694 · Note