yhirose cpp-httplib up to 0.37.1 set_follow_location certificate validation

Summaryinfo

A vulnerability marked as critical has been reported in yhirose cpp-httplib up to 0.37.1. This issue affects the function set_follow_location. The manipulation leads to certificate validation. This vulnerability is uniquely identified as CVE-2026-32627. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in yhirose cpp-httplib up to 0.37.1. This issue affects the function set_follow_location. The manipulation with an unknown input leads to a certificate validation vulnerability. Using CWE to declare the problem leads to CWE-295. The product does not validate, or incorrectly validates, a certificate. Impacted is integrity. The summary by CVE is:

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.37.2, when a cpp-httplib client is configured with a proxy and set_follow_location(true), any HTTPS redirect it follows will have TLS certificate and hostname verification silently disabled on the new connection. The client will accept any certificate presented by the redirect target — expired, self-signed, or forged — without raising an error or notifying the application. A network attacker in a position to return a redirect response can fully intercept the follow-up HTTPS connection, including any credentials or session tokens in flight. This vulnerability is fixed in 0.37.2.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-32627 since 03/12/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 302266 (Linux Distros Unpatched Vulnerability : CVE-2026-32627), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.37.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (302266). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• yhirose

Name

• cpp-httplib

Version

• 0.37.0
• 0.37.1

Website

• Product: https://github.com/yhirose/cpp-httplib/

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Be aware that VulDB is the high quality source for vulnerability data.

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