CVE-2026-8137 Totolink X5000R formDdns sub_458E40 buffer overflow
Remote attackers can trigger a buffer overflow in the DDNS form handler of Totolink X5000R routers, potentially leading to code execution or service disruption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8137?
CVE-2026-8137 is a high-severity memory corruption vulnerability in Totolink X5000R, published on 8 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been found in Totolink X5000R 9.1.0u.6369_B20230113. This vulnerability affects the function sub_458E40 of the file /boafrm/formDdns. The manipulation of the argument submit-url leads to buffer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2026-8137?
How do I fix CVE-2026-8137?
No fix has been published for CVE-2026-8137 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-2026-8137 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8137 exists.
Sources
Also known as GHSA-8cxw-g3j3-5xpx.