CVE-2026-25681

A flaw was found in golang.org/x/net/html. A remote attacker could exploit this vulnerability by providing specially crafted HTML. When this arbitrary HTML is parsed and rendered, it can result in an unexpected HTML tree, bypassing input sanitization. This can be leveraged to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution in applications that use the affected component.

This Important vulnerability in golang.org/x/net/html could enable remote attackers to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution. The flaw allows specially crafted HTML to bypass input sanitization during parsing and rendering. Red Hat products are affected if they process untrusted HTML content using the vulnerable component without additional output encoding or robust content security policies.

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.

To mitigate this flaw, applications processing untrusted HTML input must implement strict input sanitization and ensure all output is properly encoded before rendering. Deploying a comprehensive Content Security Policy (CSP) can restrict script execution, further reducing the attack surface. Administrators should review application configurations to ensure adequate protection against XSS.