CVE-2026-29076 cpp-httplib: Stack Overflow Denial of Service (DoS) via std::regex in multipart filename parsing

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.37.0, cpp-httplib uses std::regex libstdc++ to parse RFC 5987 encoded filename values in multipart Content-Disposition headers. The regex engine in libstdc++ implements backtracking via deep...