CVE-2026-6253

Name of the Vulnerable Software and Affected Versions curl (affected versions not specified)

Description curl may erroneously pass credentials intended for a first proxy to a second proxy. This occurs when curl is configured to use different proxies for different URL schemes, the first proxy requires credentials, the second proxy does not, and curl is redirected from a URL using the first proxy's scheme (e.g., http://) to a URL using a different scheme (e.g., https://) that utilizes the second proxy.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.