CVE-2026-20586 Memory corruption in MediaTek chipset

High 8.8 Published 5 Oct 2026 Updated 21 Oct 2026

A missing bounds check in the MediaTek vdec component allows remote attackers to escalate privileges via an out-of-bounds write, requiring user interaction.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-20586?

CVE-2026-20586 is a high-severity memory corruption vulnerability in MediaTek, Inc. MediaTek chipset, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

In vdec, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS11383899; Issue ID: MSV-9614.

Weakness: CWE-787

Which versions are affected by CVE-2026-20586?

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-2026-20586?

No fix has been published for CVE-2026-20586 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-2026-20586 being exploited?

There is no known exploitation of CVE-2026-20586 in the wild and no public exploit code.

Sources

Also known as GHSA-32jv-4xgq-q975.