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CVE-2026-3230— Improper key_share validation in TLS 1.3 HelloRetryRequest

Quick assessment

Affected
wolfSSL wolfSSL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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）存在安全漏洞，该漏洞源于TLS 1.3客户端HelloRetryRequest握手逻辑缺少必要的加密步骤，可能导致通过特制的HelloRetryRequest和省略key_share扩展的ServerHello消息，从(EC)DHE共享密钥推导出可预测的流量密钥，从而破坏TLS保护通信的机密性。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-3230

Vulnerability Information
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Vulnerability Title
Improper key_share validation in TLS 1.3 HelloRetryRequest
Source: CVE Program / CVE List V5
Vulnerability Description
Missing required cryptographic step in the TLS 1.3 client HelloRetryRequest handshake logic in wolfSSL could lead to a compromise in the confidentiality of TLS-protected communications via a crafted HelloRetryRequest followed by a ServerHello message that omits the required key_share extension, resulting in derivation of predictable traffic secrets from (EC)DHE shared secret. This issue does not affect the client's authentication of the server during TLS handshakes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/AU:Y/R:A/V:D/U:Clear
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
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）存在安全漏洞，该漏洞源于TLS 1.3客户端HelloRetryRequest握手逻辑缺少必要的加密步骤，可能导致通过特制的HelloRetryRequest和省略key_share扩展的ServerHello消息，从(EC)DHE共享密钥推导出可预测的流量密钥，从而破坏TLS保护通信的机密性。
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

Vendor Product Affected Versions CPE Subscribe
wolfSSL wolfSSL 0 ~ 5.9.0 -

II. Public POCs for CVE-2026-3230

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III. Intelligence Information for CVE-2026-3230

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Patches & Fixes for CVE-2026-3230 (1)

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-2026-2645 Acceptance of CertificateVerify Message before ClientKeyExchange in TLS 1.2
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-2026-4159 wc_PKCS7_DecodeEnvelopedData 1 byte out-of-bounds read

IV. Related Vulnerabilities

Same product: wolfSSL
Same vendor: wolfSSL
Same weakness: CWE-20

V. Comments for CVE-2026-3230

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