CVE-2026-20458 Memory corruption in MediaTek chipset
Remote attackers can escalate privileges via memory corruption in MediaTek modem firmware by connecting a device to 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-2026-20458?
CVE-2026-20458 is a high-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 memory corruption due to a missing bounds check. This could lead to remote escalation of privilege, 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: MOLY01402160; Issue ID: MSV-7298.
Weakness: CWE-787
Which versions are affected by CVE-2026-20458?
How do I fix CVE-2026-20458?
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-2026-20458 being exploited?
There is no known exploitation of CVE-2026-20458 in the wild and no public exploit code.
Sources
Also known as A-509305912, ASB-A-509305912, GHSA-v5qh-c8xh-h5f9, M-MOLY01402160.