PT-2026-57218 · Yhirose · Cpp-Httplib

Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-54919

Mitre

CVSS v3.1

7.4

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

CVE-2026-54919

Affected Products

Cpp-Httplib

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-54919 · Security Note
• https://github.com/yhirose/cpp-httplib/commit/fa981cedae004ea9d946f1392b9dec22fac6fee6 · Note
• https://github.com/yhirose/cpp-httplib/releases/tag/v0.47.0 · Note
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8ffh-4p95-g3p2 · Note