A critical certificate validation bypass vulnerability (CVE-2026-42013, CVSS 8.2 HIGH) exists in GnuTLS, where an attacker can craft a certificate with an oversized Subject Alternative Name field to spoof trusted entities. The article provides insufficient technical detail to specify affected version ranges, a fixed version, or a workaround.
We use optional cookies to improve your experience on our websites, such as through social media connections, and to display personalized advertising based on your online activity. If you reject optional cookies, only cookies necessary to provide you the services will be used. You may change your selection by clicking “Manage Cookies” at the bottom of the page. Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-42013 Your Privacy Choices Consumer Health Privacy