CVE-2026-46527

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, When the server has called Server::set_trusted_proxies() with a non-empty trusted-proxy list, an attacker can send an HTTP request that includes an X-Forwarded-For header whose value parses to no valid IP segments. The code path then executes get_client_ip(), which calls front() on an empty std::vector—undefined behavior in C++. On typical implementations this manifests as abnormal process termination (denial of service). With Sanitizers enabled, you get an explicit runtime diagnostic. This vulnerability is fixed in 0.44.0.

• CWE-476

• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-hg3g-vrg8-578gExploit, Mitigation, Vendor Advisory
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-hg3g-vrg8-578gExploit, Mitigation, Vendor Advisory

Published

May 29, 2026

Last Modified

Jul 22, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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