CVE-2026-103930

cpp-httplib is a C++ header-only HTTP/HTTPS library. From 0.29.0 until 0.51.0, Client::open_stream in httplib.h accepts a caller-controlled path that reaches detail::write_request_line() without the detail::encode_path() protection used by the ordinary buffered request path. Raw carriage-return and line-feed bytes in the path can therefore split the outbound HTTP/1.1 request line and inject attacker-shaped request metadata. Exploitation requires an embedding application to pass remote user input into the open_stream path and a backend or intermediary that interprets the injected bytes; the established impact is modification of backend-visible request data, not direct confidentiality or availability impact. This issue is fixed in version 0.51.0.

• CWE-113

• https://github.com/yhirose/cpp-httplib/commit/255c075b82cf9f221e6e607e8e6789e6e2bf4c2a
• https://github.com/yhirose/cpp-httplib/pull/2501
• https://github.com/yhirose/cpp-httplib/releases/tag/v0.51.0
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-vq69-f637-8fhr

Published

Oct 14, 2026

Last Modified

Oct 15, 2026

Status

Received

• 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-2026-103918oRPC is a tool that helps build APIs that are end-to-end typ…6.5
• CVE-2026-103921GraphQL Tools provides utilities for building, stitching, an…7.4
• CVE-2026-103922Capacitor is a cross-platform native runtime for web applica…9.3
• CVE-2026-103923KaTeX is a fast, easy-to-use JavaScript library for TeX math…2.1
• CVE-2026-103928Metabase is an open source business intelligence and analyti…9.3
• CVE-2026-103929mise manages dev tools like node, python, cmake, and terrafo…7.8
• CVE-2026-103937Misskey is an open source, federated social media platform. …8.7
• CVE-2026-103946An SQL injection vulnerability could allow an authenticated …8.3
• CVE-2026-103956Missing authentication for critical function in the authenti…10
• CVE-2026-103957Server-side request forgery in the OAuth2 discovery handling…6.2
• CVE-2026-103958Server-side request forgery in the tool server and remote ag…7.6
• CVE-2026-103964The Download Manager plugin for WordPress is vulnerable to S…4.3