Is this vulnerability remotely exploitable over the network?

Yes. An attacker who can intercept or influence network traffic between the cpp-httplib client and its proxy or origin server can exploit this by returning crafted HTTPS redirect responses, enabling full man-in-the-middle control over the redirected connection.

What level of access does an attacker need to exploit this issue?

The attacker needs network-level visibility or control on the path—such as being on the same Wi‑Fi network, controlling a router or proxy, or compromising intermediate infrastructure—sufficient to inject or modify HTTP redirect responses.

What is the safest general fix pattern for developers using HTTP client libraries?

Ensure that TLS certificate and hostname verification are consistently enabled and enforced on all HTTPS connections, including those created during redirect handling or proxy use, and adopt a fail-closed approach where any inability to verify certificates results in an explicit error instead of silent acceptance.

Severity:

HIGH RISK

(8.7)

Improper TLS Certificate Validation on HTTPS Redirects via Proxy (CWE-295) in cpp-httplib

CVE-2026-32627

Published:

Mar 16, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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May 6, 2026

Vulnerability Type

Category:

Improper Certificate Validation

CWE:

CWE-295

Impact:

HTTPS Traffic Interception and Man-in-the-Middle Attack

Severity:

HIGH RISK

(8.7)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Certificate Validation

CWE:

CWE-295

Impact:

HTTPS Traffic Interception and Man-in-the-Middle Attack

Severity:

HIGH RISK

(8.7)

CVSS Version:

3.1

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Improper TLS Certificate Validation on HTTPS Redirects via Proxy (CWE-295) in cpp-httplib

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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