What is CVE-2026-28434?

CVE-2026-28434 is a medium-severity vulnerability in Yhirose Cpp-httplib, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-03-04.

How severe is CVE-2026-28434?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Yhirose Cpp-httplib

CVE-2026-28434

cpp-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()…

Vulnerability class: Information Disclosure

EPSS: 0.001 (23.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Yhirose Cpp-httplib — versions < 0.35.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8mpw-r4gc-xm7q (x_refsource_CONFIRM)
https://github.com/yhirose/cpp-httplib/commit/defd907c7469c5c8281247b73bbd07be24c31164 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-28434?: CVE-2026-28434 is a medium-severity vulnerability in Yhirose Cpp-httplib, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-03-04.
How severe is CVE-2026-28434?: Medium severity. CVSS v3 base score is 5.3 out of 10.