CVE-2026-7248 -- CVSS 9.8 Vulnerability Briefing

CVE-2026-7248 | CVSS 9.8 (Critical) | Exploit: No known exploit

What Is It

A critical buffer overflow vulnerability exists in the D-Link DI-8100 router firmware (version 16.07.26A1), specifically within the tgfile_htm function of the tgfile.htm CGI endpoint.

Technical Detail

The flaw is a buffer overflow triggered by manipulating the fn argument passed to the tgfile_htm function through the CGI endpoint. An attacker can supply an oversized or malformed input value that exceeds the bounds of the allocated buffer, potentially overwriting adjacent memory. Successful exploitation could lead to remote code execution on the affected device, granting an attacker full control over the router with no prior authentication required, consistent with the CVSS 9.8 critical rating.

Exploitation Status

No known exploit code has been observed or publicly documented as of May 5, 2026. This vulnerability is not currently listed in the CISA Known Exploited Vulnerabilities catalog. The exploit maturity is assessed as no known exploit at this time, though the nature of the flaw and the exposure profile of consumer and small business routers make it a plausible target for future exploitation development.

Who Is Targeting This

No specific threat actor attribution at this time. No campaigns or targeted sectors have been associated with this vulnerability in available intelligence. Router vulnerabilities of this class have historically attracted interest from botnet operators and state-sponsored actors targeting network edge devices, but no confirmed activity has been linked to CVE-2026-7248.

What To Do

Organizations and individuals operating D-Link DI-8100 devices running firmware version 16.07.26A1 should check D-Link's official support portal immediately for a patched firmware release and apply it as soon as one is available. In the interim, restrict access to the device's web management interface by disabling remote administration and limiting access to trusted internal IP addresses only. If the CGI endpoint is exposed to the internet, treat that as an urgent remediation priority. Given that D-Link has a history of issuing end-of-life notices for older hardware, administrators should also verify whether this device model remains under active vendor support and consider replacement if it does not.