Vulnerability Details CVE-2026-9546
A vulnerability in libcurl caused the HTTP `Referer:` header to persist even
when explicitly cleared. While the documentation states that passing NULL to
`CURLOPT_REFERER` suppresses the header, the option failed to clear the
internal state. As a result the previous referrer string was erroneously
reused and sent in subsequent requests, potentially leaking sensitive
information to unintended servers.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 38.7%
CVSS Severity
CVSS v3 Score 7.5
References