Описание
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.
A flaw was found in cpp-httplib, a C++11 single-file header-only cross-platform HTTP/HTTPS library. A remote attacker can exploit this vulnerability by sending a specially crafted HTTP POST request with a malicious filename* parameter in the Content-Disposition header. This triggers uncontrolled stack growth due to the std::regex engine's deep recursion, leading to a stack overflow and causing the server process to crash, resulting in a Denial of Service (DoS).
Отчет
The vulnerability CVE-2026-29076 is of MODERATE impact. It affects applications utilizing the cpp-httplib library to parse multipart Content-Disposition headers, specifically when handling filename* values. A remote attacker can send a crafted HTTP POST request, leading to a stack overflow and denial of service in the server process. This issue primarily impacts services that accept and process such multipart requests.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Ссылки на источники
Дополнительная информация
Статус:
EPSS
5.9 Medium
CVSS3
Связанные уязвимости
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.
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.
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTT ...
EPSS
5.9 Medium
CVSS3