CVE-2026-86414criticalCWE-201

CVE-2026-86414: critical vulnerability in curl

leaking host credentials to HTTP proxy

Published · Updated

Follow this CVE+ Monitor curl+ Monitor curl

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.1epss 0.7%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
curl · curl
Related CVEs — curl

In the same product, most dangerous first.

CVE-2023-38545HIGHCVE-2023-38545EPSS 78.7%CVE-2023-38039HIGHCVE-2023-38039EPSS 56.2%CVE-2019-5436HIGHCVE-2019-5436EPSS 49.7%CVE-2024-2398HIGHHTTP/2 push headers memory-leakEPSS 36.1%CVE-2024-7264MEDIUMASN.1 date parser overreadEPSS 20.2%CVE-2023-38546—CVE-2023-38546EPSS 6.0%