CVE-2026-2909 Tenda HG9 Diagnostic Ping Endpoint formPing stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the diagnostic ping endpoint to potentially execute arbitrary code on Tenda HG9 routers.
- 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-2026-2909?
CVE-2026-2909 is a high-severity memory corruption vulnerability in Tenda HG9, published on 22 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was detected in Tenda HG9 300001138. This affects an unknown part of the file /boaform/formPing of the component Diagnostic Ping Endpoint. Performing a manipulation of the argument pingAddr results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used.
Which versions are affected by CVE-2026-2909?
It affects 1 product.
Products include Tenda Hg9 Firmware.
How do I fix CVE-2026-2909?
No fix has been published for CVE-2026-2909 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-2026-2909 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2909 exists.
Other vulnerabilities in Tenda HG9
- CVE-2022-30023 Command injection in n/a
- CVE-2026-2905 Tenda HG9 Wireless Configuration Endpoint formWlanSetup stack-based overflow
- CVE-2026-2906 Tenda HG9 Samba Configuration Endpoint formSamba stack-based overflow
- CVE-2026-2907 Tenda HG9 GPON Configuration Endpoint formgponConf stack-based overflow
- CVE-2026-2908 Tenda HG9 Loopback Detection Configuration Endpoint formLoopBack stack-based overflow
Sources
Also known as GHSA-8pgv-26pm-rgm8.