CVE-2026-2139 Tenda TX9 fast_setting_wifi_set sub_432580 buffer overflow

High 8.7 Published 8 Feb 2026 Updated 23 Feb 2026

A remote buffer overflow in the Tenda TX9 router's Wi-Fi settings allows attackers to execute arbitrary code or cause a denial of service.

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-2026-2139?

CVE-2026-2139 is a high-severity memory corruption vulnerability in Tenda TX9, published on 8 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was determined in Tenda TX9 up to 22.03.02.10_multi. Affected by this vulnerability is the function sub_432580 of the file /goform/fast_setting_wifi_set. This manipulation of the argument ssid causes buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.

Weakness: CWE-120, CWE-119

Which versions are affected by CVE-2026-2139?

It affects 1 product.

Products include Tenda Tx9 Firmware.

How do I fix CVE-2026-2139?

No fix has been published for CVE-2026-2139 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-2026-2139 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2139 exists.

Sources

Also known as GHSA-349v-v693-4xhw.