CVE-2026-20449 Memory corruption in MediaTek chipset

Medium 6.5 Published 4 May 2026 Updated 4 May 2026

A heap buffer overflow in MediaTek modem firmware allows remote attackers to cause a system crash via a rogue base station.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-20449?

CVE-2026-20449 is a medium-severity memory corruption vulnerability in MediaTek, Inc. MediaTek chipset, published on 4 May 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 system crash due to a heap buffer overflow. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01760138; Issue ID: MSV-6148.

Weakness: CWE-120

Which versions are affected by CVE-2026-20449?

It affects 68 products.

Products include Mediatek Mt2735 Firmware, Mediatek Mt2737 Firmware, Mediatek Mt6739 Firmware, Mediatek Mt6761 Firmware, Mediatek Mt6762 Firmware, Mediatek Mt6763 Firmware and 62 more.

How do I fix CVE-2026-20449?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-20449 being exploited?

There is no known exploitation of CVE-2026-20449 in the wild and no public exploit code.

Sources

Also known as A-488935936, ASB-A-488935936, GHSA-hjqf-j9p4-gv29, M-MOLY01760138.