CVE-2026-2876 Tenda A18 setBlackRule parse_macfilter_rule stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda A18 router's MAC filter rule parser, 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-2026-2876?
CVE-2026-2876 is a high-severity memory corruption vulnerability in Tenda A18, published on 21 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 A18 15.13.07.13. This affects the function parse_macfilter_rule of the file /goform/setBlackRule. This manipulation of the argument deviceList causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.
Which versions are affected by CVE-2026-2876?
It affects 1 product.
Products include Tenda A18 Firmware.
How do I fix CVE-2026-2876?
No fix has been published for CVE-2026-2876 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-2026-2876 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2876 exists.
Other vulnerabilities in Tenda A18
Sources
Also known as GHSA-pg46-g938-p94j.