CVE-2026-2645— Acceptance of CertificateVerify Message before ClientKeyExchange in TLS 1.2
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I. Basic Information for CVE-2026-2645
Vulnerability Information
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Vulnerability Title
Acceptance of CertificateVerify Message before ClientKeyExchange in TLS 1.2
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不恰当实现的标准安全检查
Source: NVD (National Vulnerability Database)
Vulnerability Title
wolfSSL（CyaSSL） 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfSSL（CyaSSL）是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL（CyaSSL） 5.8.4之前版本存在安全漏洞，该漏洞源于TLS 1.2服务器状态机实现存在逻辑缺陷，可能导致服务器在收到ClientKeyExchange消息之前错误地接受CertificateVerify消息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-2645
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Same Patch Batch · wolfSSL · 2026-03-19 · 11 CVEs total
| CVE-2026-3547 | 7.5 HIGH | wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation |
| CVE-2026-0819 | Stack buffer overflow in PKCS7 SignedData encoding with custom signed attributes | |
| CVE-2026-1005 | Integer underflow leads to out-of-bounds access in sniffer AES-GCM/CCM/ARIA-GCM decrypt pa | |
| CVE-2026-2646 | Heap buffer overflow in session parsing with wolfSSL_d2i_SSL_SESSION() function | |
| CVE-2026-3548 | Buffer overflow in CRL number parsing in wolfSSL | |
| CVE-2026-3579 | Non-constant time multiplication subroutine __muldi3 on RISC-V RV32I | |
| CVE-2026-3580 | Compiler-induced timing leak in sp_256_get_entry_256_9 on RISC-V | |
| CVE-2026-4395 | Heap-based buffer overflow in wc_ecc_import_x963_ex KCAPI path | |
| CVE-2026-3230 | Improper key_share validation in TLS 1.3 HelloRetryRequest | |
| CVE-2026-4159 | wc_PKCS7_DecodeEnvelopedData 1 byte out-of-bounds read |
IV. Related Vulnerabilities
Same product: wolfSSL
- CVE-2026-5477
Prefix-substitution forgery via integer overflow in wolfCryp - CVE-2026-5188
Integer underflow in X.509 SAN parsing in wolfSSL - CVE-2026-5500
Improper Validation of AES-GCM Authentication Tag Length in - CVE-2026-5501
Improper Certificate Signature Verification in X.509 Chain V - CVE-2026-5466
wc_VerifyEccsiHash missing sanity check
Same vendor: wolfSSL
- CVE-2026-0930
Potential wolfSSHd Buffer out-of-bounds Read on Windows Hand - CVE-2026-5477
Prefix-substitution forgery via integer overflow in wolfCryp - CVE-2026-5188
Integer underflow in X.509 SAN parsing in wolfSSL - CVE-2026-5500
Improper Validation of AES-GCM Authentication Tag Length in - CVE-2026-5501
Improper Certificate Signature Verification in X.509 Chain V
Same weakness: CWE-358
- CVE-2025-31983
HCL BigFix Service Management (SM) is affected by a security - CVE-2025-31970
HCL DFXAnalytics is affected by an Insecure Security Header - CVE-2026-22618
Eaton Intelligent Power Protector 安全漏洞 - CVE-2026-35679
Zcash 安全特征问题漏洞 - CVE-2025-13333
IBM WebSphere Application Server could provide weaker than e
V. Comments for CVE-2026-2645
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