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CVE-2026-34441 - Vulnerability Analysis

MediumCVSS: 4.8

Last Updated: April 1, 2026

cpp-httplib - HTTP Request Smuggling

Published: March 31, 2026Updated: April 1, 2026PoC AvailableRemote Exploitable

Overview

cpp-httplib < 0.40.0 contains an HTTP request smuggling vulnerability caused by the static file handler serving GET responses without consuming the request body, letting attackers smuggle arbitrary HTTP requests on keep-alive connections, exploit requires crafted HTTP/1.1 requests.

Severity & Score

Severity: Medium

CVSS Score: 4.8

Impact

Attackers can smuggle arbitrary HTTP requests, potentially bypassing security controls or causing unintended server behavior.

Mitigation

Upgrade to version 0.40.0 or later.

References

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

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Details

CVE ID: CVE-2026-34441
Severity: Medium
CVSS Score: 4.8
Type: http_request_smuggling
Status: confirmed

CWE

CWE-444

CVSS Metrics

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