CVE-2026-20461 Memory corruption in MediaTek chipset
A missing bounds check in MediaTek modem firmware allows remote attackers to cause denial of service 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-2026-20461?
CVE-2026-20461 is a medium-severity memory corruption vulnerability in MediaTek, Inc. MediaTek chipset, published on 1 Jul 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 out of bounds write due to a missing bounds check. 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: MOLY01267281 / MOLY01318201; Issue ID: MSV-6486.
Weakness: CWE-787
Which versions are affected by CVE-2026-20461?
How do I fix CVE-2026-20461?
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-2026-20461 being exploited?
There is no known exploitation of CVE-2026-20461 in the wild and no public exploit code.
Sources
Also known as GHSA-69rh-fj32-xxwg.