CVE-2026-7857 D-Link DI-8100 CGI user_group.asp sprintf buffer overflow
Remote attackers can exploit a buffer overflow in the CGI handler to execute arbitrary code on D-Link DI-8100 routers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7857?
CVE-2026-7857 is a high-severity memory corruption vulnerability in D-Link DI-8100, published on 5 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A vulnerability has been found in D-Link DI-8100 16.07.26A1. This vulnerability affects the function sprintf of the file /user_group.asp of the component CGI Handler. The manipulation leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2026-7857?
It affects 1 product.
Products include Dlink Di-8100 Firmware.
How do I fix CVE-2026-7857?
No fix has been published for CVE-2026-7857 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-7857 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7857 exists.
Other vulnerabilities in D-Link DI-8100
- CVE-2025-44083 Auth bypass in n/a
- CVE-2026-7853 D-Link DI-8100 HTTP auto_reboot.asp sprintf buffer overflow
- CVE-2026-7854 D-Link DI-8100 POST Parameter url_rule.asp url_rule_asp buffer overflow
- CVE-2026-7248 D-Link DI-8100 CGI Endpoint tgfile.htm tgfile_htm buffer overflow
- CVE-2026-7855 D-Link DI-8100 HTTP Request tggl.asp tggl_asp buffer overflow
Sources
Also known as GHSA-v647-rh6c-m9fr.