CVE-2026-2645
Received Received - Intake
Logic Flaw in wolfSSL TLS 1.2 Server State Machine

Publication date: 2026-03-19

Last updated on: 2026-04-29

Assigner: wolfSSL Inc.

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.
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Meta Information
Published
2026-03-19
Last Modified
2026-04-29
Generated
2026-06-16
AI Q&A
2026-03-19
EPSS Evaluated
2026-06-15
NVD
CVE-2026-2645
EUVD
EUVD-2026-13135
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wolfssl wolfssl to 5.8.4 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-358 The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique.
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Executive Summary

This vulnerability exists in wolfSSL versions 5.8.2 and earlier, where a logic flaw in the TLS 1.2 server state machine allows the server to incorrectly accept the CertificateVerify message before receiving the ClientKeyExchange message. This breaks the expected sequence of the TLS handshake, potentially allowing protocol misuse or attacks that exploit this message order flaw.

Impact Analysis

The impact of this vulnerability is that an attacker could exploit the incorrect message ordering in the TLS handshake to potentially bypass certain security checks or cause unexpected behavior in the TLS server. This could lead to weakened security guarantees during the TLS handshake, possibly exposing communications to interception or manipulation.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade wolfSSL to version 5.8.4 or later. Version 5.8.4 includes enhanced sanity checks on the ordering of TLS handshake messages for TLS 1.2 and earlier, preventing the server from incorrectly accepting the CertificateVerify message before the ClientKeyExchange message.

Additionally, version 5.9.0 further hardens the handshake process to catch this issue even earlier.

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