Logic Flaw in TLS Server State Machine of wolfSSL by wolfSSL
CVE-2026-2645

5.5MEDIUM

Key Information:

Vendor

Wolfssl

Status
Wolfssl
Vendor
CVE Published:
19 March 2026

What is CVE-2026-2645?

A logic flaw exists in the TLS 1.2 server state machine implementation in wolfSSL versions 5.8.2 and earlier. This flaw allows the server to erroneously accept the CertificateVerify message prior to receiving the ClientKeyExchange message. This misstep could lead to potential weaknesses in the handshake process, emphasizing the need for upgrades to version 5.8.4 or later where enhancements have been made to detect such issues during the handshake more effectively.

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Affected Version(s)

wolfSSL 0 < 5.8.4

References

https://github.com/wolfSSL/wolfssl/pull/9694

CVSS V4

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kai Tian
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