CVE-2026-9546 — sending old referer
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` suppr…
Published: 2026-07-03 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7