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5.9 Medium

CVE-2026-29076 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library

Description

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 recursion, consuming one stack frame per input character. An attacker can send a single HTTP POST request with a crafted filename* parameter that causes uncontrolled stack growth, resulting in a stack overflow (SIGSEGV) that crashes the server process. This issue has been patched in version 0.37.0.

Affected products and versions

Product Affected versions Fixed in
cpp-httplib 0.37 earliest → < 0.37.0 0.37.0

Other CVEs of cpp-httplib

The 24 CVEs of cpp-httplib →
CVE-2026-103930 cpp-httplib is a C++ header-only HTTP/HTTPS library 3.7 Low CVE-2026-102944 cpp-httplib is a C++ header-only HTTP/HTTPS library 7.5 High CVE-2026-77358 cpp-httplib is a C++ header-only HTTP/HTTPS library 8.2 High CVE-2026-77341 cpp-httplib is a C++ header-only HTTP/HTTPS library 5.3 Medium
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