What’s Vulnerable › Vulnerabilities
CVE-2026-32627: cpp-httplib has a Silent TLS Certificate Verification Bypass on HTTPS Redirect via Proxy
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-16 · updated 2026-06-17
- Weakness: CWE-295
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
- yhirose cpp-httplib: before 0.37.2 — fixed in 0.37.2
How to fix
Upgrade to a fixed version: yhirose cpp-httplib 0.37.2. Check the vendor advisory for mitigations.
References
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