CVE-2026-29076

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.

• CWE-674
• CWE-1333

• https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6Patch
• https://github.com/yhirose/cpp-httplib/releases/tag/v0.37.0Product, Release Notes
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qq6v-r583-3h69Exploit, Vendor Advisory

Published

Mar 7, 2026

Last Modified

Jun 17, 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.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-29070Open WebUI is a self-hosted artificial intelligence platform…8.1
• CVE-2026-29071Open WebUI is a self-hosted artificial intelligence platform…4.3
• CVE-2026-29072Discourse is an open-source discussion platform. Prior to ve…7.5
• CVE-2026-29073SiYuan is a personal knowledge management system. Prior to v…8.8
• CVE-2026-29074SVGO, short for SVG Optimizer, is a Node.js library and comm…7.5
• CVE-2026-29075Mesa is an open-source Python library for agent-based modeli…9.8
• CVE-2026-29077Frappe is a full-stack web application framework. Prior to v…7.1
• CVE-2026-29078Lexbor is a web browser engine library. Prior to 2.7.0, the …7.5
• CVE-2026-29079Lexbor is a web browser engine library. Prior to 2.7.0, a ty…7.5
• CVE-2026-2908A security vulnerability has been detected in Tenda HG9 3000…8.8
• CVE-2026-29080A SQL injection vulnerability in `FilterEngine.create_sqla_q…8.8
• CVE-2026-29081Frappe is a full-stack web application framework. Prior to v…8.8