CVE-2026-29076
Medium · 5.9CVSS
5.9
EPSS
0.6%
Published
Mar 7, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Tumbleweed | cpp-httplib | 0 | 0.38.0-1.1 |
Related vulnerabilities
- CVE-2026-46527 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-45372 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-34441 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-33745 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-32627 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-28434 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-28435 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-22776 cpp-httplib vulnerable to a denial of service (DOS) using a zip bomb Also affects cpp-httplib