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I. Basic Information for CVE-2026-21428
Vulnerability Information

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Vulnerability Title
cpp-httplib has CRLF injection in http headers
Source: NVD (National Vulnerability Database)
Vulnerability Description
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.0, the ``write_headers`` function does not check for CR & LF characters in user supplied headers, allowing untrusted header value to escape header lines. This vulnerability allows attackers to add extra headers, modify request body unexpectedly & trigger an SSRF attack. When combined with a server that supports http1.1 pipelining (springboot, python twisted etc), this can be used for server side request forgery (SSRF). Version 0.30.0 fixes this issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: NVD (National Vulnerability Database)
Vulnerability Title
cpp-httplib 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cpp-httplib是yhirose个人开发者的一款使用C++语言编写的HTTP/HTTPS服务器和客户端库。 cpp-httplib 0.30.0之前版本存在注入漏洞,该漏洞源于未检查用户提供标头中的CR和LF字符,可能导致添加额外标头、修改请求主体和触发服务端请求伪造攻击。
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
VendorProductAffected VersionsCPESubscribe
yhirosecpp-httplib < 0.30.0 -
II. Public POCs for CVE-2026-21428
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III. Intelligence Information for CVE-2026-21428
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