pp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, when a request handler throws a C++ exception and the application has not registered a custom exception handler via set_exception_handler(), the library catches the exception and writes its message directly into the HTTP response as a header named EXCEPTION_WHAT. This header is sent to whoever made the request, with no authentication check and no special configuration required to trigger it. The behavior is on by default. A developer who does not know to opt in to set_exception_handler() will ship a server that leaks internal exception messages to any client. This vulnerability is fixed in 0.35.0.
| Link | Resource |
|---|---|
| https://github.com/yhirose/cpp-httplib/commit/defd907c7469c5c8281247b73bbd07be24c31164 | Patch |
| https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8mpw-r4gc-xm7q | Exploit Mitigation Vendor Advisory |
05 Mar 2026, 22:11
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:* | |
| References | () https://github.com/yhirose/cpp-httplib/commit/defd907c7469c5c8281247b73bbd07be24c31164 - Patch | |
| References | () https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8mpw-r4gc-xm7q - Exploit, Mitigation, Vendor Advisory | |
| First Time |
Yhirose
Yhirose cpp-httplib |
|
| CWE | NVD-CWE-noinfo |
04 Mar 2026, 20:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Published : 2026-03-04 20:16
Updated : 2026-03-05 22:11
NVD link : CVE-2026-28434
Mitre link : CVE-2026-28434
CVE.ORG link : CVE-2026-28434
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