CVE-2026-20446 Integer overflow in MediaTek chipset

Medium 4.3 Published 7 Apr 2026 Updated 7 Apr 2026

An integer overflow in MediaTek chipset secure boot allows local attackers with physical access to cause a denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-20446?

CVE-2026-20446 is a medium-severity vulnerability in MediaTek, Inc. MediaTek chipset, published on 7 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In sec boot, there is a possible out of bounds write due to an integer overflow. This could lead to local denial of service, if an attacker has physical access to the device, with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS09963054; Issue ID: MSV-3899.

Weakness: CWE-190, CWE-787

Which versions are affected by CVE-2026-20446?

It affects 1 product.

Products include Mediatek Mt6813 Firmware.

How do I fix CVE-2026-20446?

No fix has been published for CVE-2026-20446 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-20446 being exploited?

There is no known exploitation of CVE-2026-20446 in the wild and no public exploit code.

Sources

Also known as GHSA-xv4p-823r-9vr8.