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.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/yhirose/cpp-httplib/commit/fa981cedae004ea9d946f1392b9dec22fac6fee6 Patch
- https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8ffh-4p95-g3p2 Mitigation, Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.4 · yhiroseNVD modified 2026-10-25 15:10
Affected (CPE criteria) 1
cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*
References 3
- https://github.com/yhirose/cpp-httplib/commit/fa981cedae004ea9d946f1392b9dec22fac6fee6 Patch
- https://github.com/yhirose/cpp-httplib/releases/tag/v0.47.0 Product, Release Notes
- https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8ffh-4p95-g3p2 Mitigation, Patch, Vendor Advisory