CVE-2026-3549— ECH parsing heap buffer overflow
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I. Basic Information for CVE-2026-3549
Vulnerability Information
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Vulnerability Title
ECH parsing heap buffer overflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
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）存在安全漏洞，该漏洞源于TLS 1.3 ECH解析存在堆溢出，在计算缓冲区长度时存在整数下溢，可能导致写入超出已分配缓冲区的边界。
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-2026-3549
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IV. Related Vulnerabilities
Same product: wolfSSL
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V. Comments for CVE-2026-3549
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