CVE-2026-86414
priority · track · 0EPSS 0.003 · 20 %ileDEFRUSEPSS · scored 2026-10-22
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:`.
cvss
Technical severity, 0–10. One row per scoring source.
No CVSS score recorded.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (4)
Products and version ranges known to be affected.
advisories (4)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-3904cURL: Mehrere SchwachstellenDeutsch2026-10-13csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in cURL ausnutzen, um beliebigen Programmcode auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren oder einen Denial-of-Service-Zustand auszulösen.
- CERTFR-2026-AVI-1307Multiples vulnérabilités dans CurlFrançais2026-10-14vendor · certfrFR
- CERTFR-2026-AVI-1376Multiples vulnérabilités dans le noyau Linux d'UbuntuFrançais2026-10-23vendor · certfrFR
- CURL-CVE-2026-86414leaking host credentials to HTTP proxy2026-10-14vendor · osvUS
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:`.
sources
Which sources assert this record, and when.
references (3) nvd
External citations — patches, advisories, analysis.
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