CVE Watch7 jul 2026

CVE-2026-9546

A vulnerability in libcurl caused the HTTP `Referer:` header to persist even when explicitly cleared. While the documentation states that pa

CVSS

7.5

Alto

EPSS

0.7%

p47

KEV

—

Exploit Today

0-100

Publicado: 3 jul 2026 · Última mod.: 7 jul 2026

EPSS · 30d

0.2%EPSS · 30 días0.7%

2026-07-042026-07-17

Descripción técnica

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.

Referencias oficiales

curl.sehttps://curl.se/docs/CVE-2026-9546.html
curl.sehttps://curl.se/docs/CVE-2026-9546.json
hackerone.comhttps://hackerone.com/reports/3754343
hackerone.comhttps://hackerone.com/reports/3754343

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