CVEvulnerability
CVE-2026-86414
- Status
- Awaiting Analysis
- Published
- 2026-10-20
- Last modified
- 2026-10-22
- Assigner
- 2499f714-1537-4658-8207-48ae4bb9eae9
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://curl.se/docs/CVE-2026-86414.html curl.se
- https://curl.se/docs/CVE-2026-86414.json curl.se
- https://hackerone.com/reports/3993566 hackerone.com