CVE-2026-20466 Memory corruption in MediaTek chipset
A heap buffer overflow in MediaTek secure boot allows local privilege escalation via physical access without user interaction.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20466?
CVE-2026-20466 is a medium-severity memory corruption vulnerability in MediaTek, Inc. MediaTek chipset, published on 3 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929.
Weakness: CWE-787
Which versions are affected by CVE-2026-20466?
How do I fix CVE-2026-20466?
No fix has been published for CVE-2026-20466 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-2026-20466 being exploited?
There is no known exploitation of CVE-2026-20466 in the wild and no public exploit code.
Sources
Also known as GHSA-4fw3-96wh-rv55.