VULNERABILITY INTELLIGENCE

CVE-2026-9546

CVSS score7.5 HIGH
EPSS probability0.65%
CISA KEVNot currently listed
Published2026-07-03
Last modified2026-09-15
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Weakness classification

  • 2499f714-1537-4658-8207-48ae4bb9eae9: CWE-200
  • nvd@nist.gov: NVD-CWE-noinfo

Primary references