CVE-2026-34441

Published: Mar 31, 2026Modified: Jul 24, 2026

6.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitability: 3.9 / Impact: 2.5

Source: NVD

Description

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 request body. On HTTP/1.1 keep-alive connections, the unread body bytes remain on the TCP stream and are interpreted as the start of a new HTTP request. An attacker can embed an arbitrary HTTP request inside the body of a GET request, which the server processes as a separate request. This issue has been patched in version 0.40.0.

Affected (1)

Products: Yhirose: Cpp Httplib

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Yhirose Cpp Httplib	Before 0.40.0

Related CWEs

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References (2)

https://github.com/yhirose/cpp-httplib/releases/tag/v0.40.0

Source: security-advisories@github.com

ProductRelease Notes

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-jv63-rm9j-6jwc

Source: security-advisories@github.com

ExploitMitigationVendor Advisory

Timeline

No history available yet.