CVE-2026-9546

A flaw was found in libcurl. This vulnerability causes the HTTP Referer header to persist even after it has been explicitly cleared. This can lead to the previous referrer string being unintentionally reused and sent in subsequent requests, potentially disclosing sensitive information to unintended servers.

Important: A flaw in libcurl allows for sensitive information disclosure. Despite attempts to explicitly clear the HTTP Referer header, its internal state persists, leading to the unintended reuse and transmission of previous referrer strings in subsequent requests. This could expose sensitive data to unintended third-party servers in Red Hat products and services that rely on libcurl for HTTP communications.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.