Vulnerability in Wolfssl
CVE-2026-2645
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.
EPSS: 0.001 (2.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Wolfssl — versions 0
Weakness classification (CWE)
References
- facts@wolfssl.com (Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2026-2645?
- CVE-2026-2645 is a high-severity vulnerability in Wolfssl, classified under CWE-358. CVSS score: 7.5/10. Published 2026-03-19.
- How severe is CVE-2026-2645?
- High severity. CVSS v3 base score is 7.5 out of 10.