CVE-2026-20543 Information disclosure in MediaTek chipset

Medium 5.5 Published 5 Oct 2026 Updated 5 Oct 2026

A logic error in MediaTek chipset firmware allows local attackers to disclose sensitive information without user interaction or elevated privileges.

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-2026-20543?

CVE-2026-20543 is a medium-severity 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 Modem, there is a possible information disclosure due to a logic error. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01645293; Issue ID: MSV-6761.

Weakness: CWE-215

Which versions are affected by CVE-2026-20543?

It affects 83 products.

Products include Mediatek Mt2716 Firmware, Mediatek Mt2735 Firmware, Mediatek Mt2737 Firmware, Mediatek Mt6739 Firmware, Mediatek Mt6761 Firmware, Mediatek Mt6762 Firmware and 77 more.

How do I fix CVE-2026-20543?

No fix has been published for CVE-2026-20543 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-20543 being exploited?

There is no known exploitation of CVE-2026-20543 in the wild and no public exploit code.

Sources

Also known as GHSA-xph5-44g7-gggh.