CVE-2026-86414

None

CVSS

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EPSS

0.3%

Published

Oct 20, 2026

CISA due date

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The record

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:`.

Affected packages

Ecosystem	Package	Introduced	Fixed