CVE-2026-9546
sending old referer
Description
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.
INFO
Published Date :
July 3, 2026, 6:18 a.m.
Last Modified :
July 3, 2026, 6:18 a.m.
Remotely Exploit :
No
Source :
curl
Affected Products
The following products are affected by CVE-2026-9546
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update libcurl to the latest version.
- Apply any relevant security patches.
- Verify Referer header is cleared correctly.
- Review affected application configurations.
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CVE-2026-9546 vulnerability anywhere in the article.