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CVE-2026-32627

Yhirose Cpp-httplib vulnerability

8.7 HIGHPublic exploitEPSS 0.25%
  1. Published16 Mar 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected products

Yhirose Cpp-httplib< 0.37.2

Remediation

Fixed in
Yhirose Cpp-httplib≥ 0.37.2

References

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Frequently asked

Is CVE-2026-32627 being actively exploited?

CVE-2026-32627 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.25%.

How severe is CVE-2026-32627?

CVE-2026-32627 has a CVSS 3.1 base score of 8.7, rated high. EPSS estimates a 0.25% probability of exploitation.

Which products are affected by CVE-2026-32627?

Affected products include Yhirose Cpp-httplib.

How do I fix CVE-2026-32627?

Upgrade affected software to a fixed version, for example Yhirose Cpp-httplib 0.37.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-32627 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.