CVE-2026-2645
Acceptance of CertificateVerify Message before ClientKeyExchange in TLS 1.2
- State
- Published
- Severity
- 5.5 Medium
- Published
- Mar 19, 2026
- Updated
- Mar 19, 2026
- Reserved
- Feb 17, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.5 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P | wolfSSL |
Weaknesses
- CWE-358 Improperly Implemented Security Check for Standard
Affected Products
| Product | Versions |
|---|---|
wolfSSLwolfSSL |
|
References
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