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OpenAdvisories
High · 8.7 CVE-2026-32627 EUVD-2026-12137

cpp-httplib has a Silent TLS Certificate Verification Bypass on HTTPS Redirect via Proxy

Published Mar 13, 2026 · Updated Mar 16, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
yhirose cpp-httplib < 0.37.2 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 cpp-httplib 0.41.0+ds-3 —
Debian 13 cpp-httplib No fix yet —
Debian 12 cpp-httplib No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 cpp-httplib No fix yet —
Ubuntu 25.10 cpp-httplib No fix yet —
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 26.04 LTS cpp-httplib No fix yet —
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed cpp-httplib 0.38.0-1.1 openSUSE-SU-2026:10435-1

Advisories 1

References