Detections
Analytics
CVE-2026-86414
critical
Description
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:`.
References
https://hackerone.com/reports/3993566
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-105306