CVE-2026-20489 Integer overflow in MediaTek chipset

Medium 4.4 Published 3 Aug 2026 Updated 3 Aug 2026

A local attacker with System privileges can exploit an integer overflow in the display component to disclose sensitive information.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-20489?

CVE-2026-20489 is a medium-severity vulnerability in MediaTek, Inc. MediaTek chipset, published on 3 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In display, there is a possible information disclosure due to an integer overflow. This could lead to local information disclosure if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11004274; Issue ID: MSV-7749.

Weakness: CWE-125

Which versions are affected by CVE-2026-20489?

It affects 17 products.

Products include Mediatek Mt6991 Firmware, Mediatek Mt6993 Firmware, Mediatek Mt8126 Firmware, Mediatek Mt8171 Firmware, Mediatek Mt8188 Firmware, Mediatek Mt8189 Firmware and 11 more.

How do I fix CVE-2026-20489?

No fix has been published for CVE-2026-20489 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-20489 being exploited?

There is no known exploitation of CVE-2026-20489 in the wild and no public exploit code.

Sources

Also known as GHSA-pjw7-ch96-93hj.