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CVE-2026-32627— cpp-httplib has a Silent TLS Certificate Verification Bypass on HTTPS Redirect via Proxy

Quick assessment

Affected
yhirose cpp-httplib
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.

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 0.37.2之前版本存在信任管理问题漏洞，该漏洞源于配置代理并启用set_follow_location的客户端在遵循HTTPS重定向时，新连接上的TLS证书和主机名验证会被静默禁用，可能导致网络攻击者拦截后续HTTPS连接，包括传输中的凭据或会话令牌。

CVSS 8.7 · High EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol
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I. Basic Information for CVE-2026-32627

Vulnerability Information
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Vulnerability Title
cpp-httplib has a Silent TLS Certificate Verification Bypass on HTTPS Redirect via Proxy
Source: CVE Program / CVE List V5
Vulnerability Description
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.37.2, when a cpp-httplib client is configured with a proxy and set_follow_location(true), any HTTPS redirect it follows will have TLS certificate and hostname verification silently disabled on the new connection. The client will accept any certificate presented by the redirect target — expired, self-signed, or forged — without raising an error or notifying the application. A network attacker in a position to return a redirect response can fully intercept the follow-up HTTPS connection, including any credentials or session tokens in flight. This vulnerability is fixed in 0.37.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
cpp-httplib 信任管理问题漏洞
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 0.37.2之前版本存在信任管理问题漏洞，该漏洞源于配置代理并启用set_follow_location的客户端在遵循HTTPS重定向时，新连接上的TLS证书和主机名验证会被静默禁用，可能导致网络攻击者拦截后续HTTPS连接，包括传输中的凭据或会话令牌。
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
yhirose cpp-httplib < 0.37.2 -

II. Public POCs for CVE-2026-32627

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III. Intelligence Information for CVE-2026-32627

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Vendor Advisories for CVE-2026-32627 (1)

IV. Related Vulnerabilities

Same product: cpp-httplib
Same vendor: yhirose
Same weakness: CWE-295

V. Comments for CVE-2026-32627

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