CVE-2026-32627: Yhirose Cpp-Httplib

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Yhirose Cpp-Httplib: before 0.37.2 (fixed in 0.37.2)

Published 2026-03-16. Last modified 2026-06-17.