What is CVE-2026-34441?

CVE-2026-34441 is a medium-severity vulnerability in Yhirose Cpp-httplib, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 4.8/10. Published 2026-03-31.

How severe is CVE-2026-34441?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Yhirose Cpp-httplib

CVE-2026-34441

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp-httplib is vulnerable to HTTP Request Smuggling. The server's static file handler serves GET responses without consuming the req…

Vulnerability class: HTTP Request Smuggling

EPSS: 0.001 (19.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Yhirose Cpp-httplib — versions < 0.40.0

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-jv63-rm9j-6jwc (x_refsource_CONFIRM)
https://github.com/yhirose/cpp-httplib/releases/tag/v0.40.0 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34441?: CVE-2026-34441 is a medium-severity vulnerability in Yhirose Cpp-httplib, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 4.8/10. Published 2026-03-31.
How severe is CVE-2026-34441?: Medium severity. CVSS v3 base score is 4.8 out of 10.