CVE-2026-20588 Memory corruption in MediaTek chipset

Medium 6.7 Published 5 Oct 2026 Updated 21 Oct 2026

A missing bounds check in MediaTek mtee allows local privilege escalation for attackers with System privileges.

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-2026-20588?

CVE-2026-20588 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 mtee, there is a possible escalation of privilege due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11383899; Issue ID: MSV-9607.

Weakness: CWE-787

Which versions are affected by CVE-2026-20588?

It affects 25 products.

Products include Mediatek Mt2718 Firmware, Mediatek Mt6768 Firmware, Mediatek Mt6769 Firmware, Mediatek Mt6789 Firmware, Mediatek Mt6833 Firmware, Mediatek Mt6855 Firmware and 19 more.

How do I fix CVE-2026-20588?

No fix has been published for CVE-2026-20588 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-2026-20588 being exploited?

There is no known exploitation of CVE-2026-20588 in the wild and no public exploit code.

Sources

Also known as GHSA-xxc4-28wg-vmv2.