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CVE-2026-54919— cpp-httplib: TLS certificate chain verification bypassed for IP-literal hosts on Mbed TLS and wolfSSL backends

Quick assessment

Affected
yhirose cpp-httplib
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

yhirose cpp-httplib是yhirose个人开发者开源的一款使用C++语言编写的HTTP/HTTPS服务器和客户端库。 yhirose cpp-httplib存在加密问题漏洞，该漏洞源于使用Mbed TLS或wolfSSL后端时，当客户端连接到IP文字主机且服务器证书验证开启时，SSLClient和Client在HTTPS模式下会跳过证书链验证，Mbed TLS后端的WebSocketClient则完全跳过验证，导致中间人攻击者可以通过拦截流量并出示精心构造的证书来读取或修改流量。以下版本受

CVSS 7.4 · High EPSS 0.26% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
yhirose cpp-httplib >= 0.31.0, < 0.47.0 affected
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I. Basic Information for CVE-2026-54919

Vulnerability Information
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Vulnerability Title
cpp-httplib: TLS certificate chain verification bypassed for IP-literal hosts on Mbed TLS and wolfSSL backends
Source: CVE Program / CVE List V5
Vulnerability Description
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In affected Mbed TLS backend versions from 0.31.0 through 0.46.1 and wolfSSL backend versions from 0.33.0 through 0.46.1, when cpp-httplib is built with CPPHTTPLIB_MBEDTLS_SUPPORT or CPPHTTPLIB_WOLFSSL_SUPPORT and a client connects to an IP-literal host with server certificate verification enabled, SSLClient and Client in HTTPS mode skip certificate chain validation and WebSocketClient on the Mbed TLS backend skips verification altogether, allowing a man-in-the-middle attacker positioned to intercept traffic to present a crafted certificate and read or modify the traffic. This issue is fixed in version 0.47.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/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
yhirose cpp-httplib 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
yhirose cpp-httplib是yhirose个人开发者开源的一款使用C++语言编写的HTTP/HTTPS服务器和客户端库。 yhirose cpp-httplib存在加密问题漏洞，该漏洞源于使用Mbed TLS或wolfSSL后端时，当客户端连接到IP文字主机且服务器证书验证开启时，SSLClient和Client在HTTPS模式下会跳过证书链验证，Mbed TLS后端的WebSocketClient则完全跳过验证，导致中间人攻击者可以通过拦截流量并出示精心构造的证书来读取或修改流量。以下版本受
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 >= 0.31.0, < 0.47.0 -

II. Public POCs for CVE-2026-54919

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8572 chars
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III. Intelligence Information for CVE-2026-54919

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Patches & Fixes for CVE-2026-54919 (2)

Vendor Advisories for CVE-2026-54919 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-54919

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