Is CVE-2026-7855 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-7855 being exploited in the wild.

How severe is CVE-2026-7855?

High severity, with a CVSS score of 8.8, published 5 May 2026.

Is there a fix for CVE-2026-7855?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-7855 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-7855?

Check whether you run Dlink Di-8100 or Dlink Di-8100 Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-7855: D-Link DI-8100 buffer overflow in tggl_asp function

CVE-2026-7855 · Severity: high · CVSS 8.8 · Published 2026-05-05

A security vulnerability exists in the D-Link DI-8100 router, a device used for managing small business and home network traffic. An attacker can exploit this flaw to crash the router's management interface or potentially take full control of the device. This could lead to a total loss of internet connectivity for the office or unauthorized access to internal network settings.

Technologies: Dlink Di-8100, Dlink Di-8100 Firmware. Vendors: Dlink.

Quick answers

Is CVE-2026-7855 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-7855 being exploited in the wild.
How severe is CVE-2026-7855?: High severity, with a CVSS score of 8.8, published 5 May 2026.
Which products and versions are affected?: D-Link DI-8100 16.07.26A1.
Is there a fix for CVE-2026-7855?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-7855 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-7855?: Check whether you run Dlink Di-8100 or Dlink Di-8100 Firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A stack-based buffer overflow (CWE-121) exists in the D-Link DI-8100 router firmware version 16.07.26A1. The vulnerability is located within the tggl_asp function of the HTTP Request Handler component, which processes requests to /tggl.asp. The flaw is triggered by unbounded sprintf and strcat operations on a fixed-size 10240-byte stack buffer when handling the 'Name' parameter during an 'opt=add' action. A remote attacker with low-level authentication can exploit this to crash the httpd service or achieve remote code execution on the MIPS-based architecture. A public proof-of-concept exploit has been disclosed.

Affected products

D-Link DI-8100 16.07.26A1

Timeline

2026-05-05: disclosed
2026-05-05: advisory

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.