CVE-2026-20528 Memory corruption in MediaTek chipset

Medium 6.7 Published 5 Oct 2026 Updated 6 Oct 2026

A missing bounds check in MediaTek chipset firmware allows local attackers with System privileges to cause memory corruption, leading to information disclosure or privilege escalation.

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-2026-20528?

CVE-2026-20528 is a medium-severity memory corruption vulnerability in MediaTek, Inc. MediaTek chipset, published on 5 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In ccci, there is a possible out of bounds write and read due to a missing bounds check. This could lead to local information disclosure, memory corruption, crashes, or privilege escalation if a malicious actor has already obtained the System privilege. User interaction is needed for exploitation. Patch ID: ALPS11428950 (Note: For MT6880, MT6890) / ALPS10563453 (Note: For MT6980D, MT6990, MT6986, MT6986D, MT6813, MT6988) / AUTO00858766 (Note: For MT2735, MT2737); Issue ID: MSV-9893.

Weakness: CWE-787

Which versions are affected by CVE-2026-20528?

It affects 10 products.

Products include Mediatek Mt2735 Firmware, Mediatek Mt2737 Firmware, Mediatek Mt6813 Firmware, Mediatek Mt6880 Firmware, Mediatek Mt6890 Firmware, Mediatek Mt6980d Firmware and 4 more.

How do I fix CVE-2026-20528?

No fix has been published for CVE-2026-20528 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-2026-20528 being exploited?

There is no known exploitation of CVE-2026-20528 in the wild and no public exploit code.

Sources

Also known as GHSA-4qxx-g536-wh52.