CVE-2026-86414 — leaking host credentials to HTTP proxy
An HTTP proxy can trick libcurl into sending the origin's credentials (Basic password, or a Negotiate/Kerberos ticket) to the proxy itself, by answering the `CONNECT` tunnel req…
Published: 2026-10-20 · CVSS: Unscored
An HTTP proxy can trick libcurl into sending the origin's credentials (Basic password, or a Negotiate/Kerberos ticket) to the proxy itself, by answering the `CONNECT` tunnel request with 401 `WWW-Authenticate:` instead of the expected 407 `Proxy-Authenticate:`.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7