CVE-2026-32627CWE-295

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

High · published March 13, 2026

CVSS v3.1
8.7
EPSS
0%
Percentile
16.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00258 · 16.5th percentile
Weakness
CWE-295 · Improper Certificate Validation
Published
2026-03-13T20:48Z
EPSS history
Timeline
  • 13 MAR 20:48Z
    cpp-httplib has a Silent TLS Certificate Verification Bypass on HTTPS Redirect via Proxy
    cvelistv5