CURL-CVE-2026-86414

vendorUSosv

leaking host credentials to HTTP proxy

view advisory published 2026-10-14Licence: per source

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:`.

01

describes (1)

Related CVEs.

IDseverity exploitable
CVE-2026-86414US——
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 reques…
scry

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