CVE-2026-51846 Memory corruption in n/a

Critical 9.8 Published 19 Jun 2026 Updated 22 Jun 2026

A stack buffer overflow in the Tenda AC7 router allows remote attackers to execute arbitrary code via the wanSpeed parameter.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-51846?

CVE-2026-51846 is a critical memory corruption vulnerability in Tenda Ac7 Firmware, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Tenda AC7 v15.03.06.44, the wanSpeed parameter of the route /goform/AdvSetMacMtuWan has a stack buffer overflow vulnerability that can lead to remote arbitrary code execution.

Weakness: CWE-121

Which versions are affected by CVE-2026-51846?

It affects 1 product.

Products include Tenda Ac7 Firmware.

How do I fix CVE-2026-51846?

No fix has been published for CVE-2026-51846 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-2026-51846 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-51846 exists.

All Tenda Ac7 Firmware vulnerabilities

Sources

Also known as GHSA-j57g-r926-cwvq.