CVE-2026-2191 Tenda AC9 formGetDdosDefenceList stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda AC9 router's DDoS defense list function, potentially leading to code execution or service disruption.
- 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-2026-2191?
CVE-2026-2191 is a high-severity memory corruption vulnerability in Tenda Ac9 Firmware, published on 8 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A weakness has been identified in Tenda AC9 15.03.06.42_multi. Affected is the function formGetDdosDefenceList. This manipulation of the argument security.ddos.map causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks.
Which versions are affected by CVE-2026-2191?
It affects 1 product.
Products include Tenda Ac9 Firmware.
How do I fix CVE-2026-2191?
No fix has been published for CVE-2026-2191 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-2026-2191 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2191 exists.
Other vulnerabilities in Tenda Ac9 Firmware
Sources
Also known as GHSA-j5pp-jx5r-4q45.