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.

Related CPE's


Vulnerable

References




https://hackerone.com/reports/3754343

ExploitIssue TrackingThird Party Advisory

https://hackerone.com/reports/3754343

ExploitIssue TrackingThird Party Advisory

Weaknesses


2499f714-1537-4658-8207-48ae4bb9eae9

Secondary

CWE-200


NVD-CWE-noinfo

CVSS impact metrics


CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

7.5 · High

Information


Source identifier

2499f714-1537-4658-8207-48ae4bb9eae9

Vulnerability status

Modified

Published

2026-07-03T07:16:25.893Z

3 months ago

Last modified

2026-09-15T07:16:35.130Z

3 weeks ago