EUVD-2026-12137CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
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3Description
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.
Analysis
cpp-httplib versions before 0.37.2 silently disable TLS certificate validation when following HTTPS redirects through a proxy, allowing attackers to intercept encrypted connections without detection. This affects any application using cpp-httplib as an HTTP client with proxy and redirect following enabled. …
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Remediation
Within 24 hours: inventory all applications and services using cpp-httplib versions before 0.37.2 and document their criticality and proxy/redirect configuration. Within 7 days: disable proxy redirect following where operationally feasible, or isolate affected systems from untrusted networks. …
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