CVE-2026-86414

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:`.

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Produits concernés

• curl

Références

• https://curl.se/docs/CVE-2026-86414.html
• https://curl.se/docs/CVE-2026-86414.json
• https://hackerone.com/reports/3993566

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories