CVE-2026-20408 Memory corruption in MediaTek chipset
A heap buffer overflow in MediaTek chipsets allows remote attackers to escalate privileges 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-2026-20408?
CVE-2026-20408 is a high-severity memory corruption vulnerability in Mediatek Software Development Kit, published on 2 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In wlan, there is a possible out of bounds write due to a heap buffer overflow. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00461651; Issue ID: MSV-4758.
Which versions are affected by CVE-2026-20408?
It affects 2 products.
Products include Mediatek Software Development Kit, Openwrt Openwrt.
How do I fix CVE-2026-20408?
No fix has been published for CVE-2026-20408 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-2026-20408 being exploited?
There is no known exploitation of CVE-2026-20408 in the wild and no public exploit code.
Other vulnerabilities in Mediatek Software Development Kit
- CVE-2025-20681 Memory corruption in MT6890, MT7615, MT7622, MT7663, MT7915
- CVE-2025-20682 Memory corruption in MT6890, MT7615, MT7622, MT7663, MT7915, MT7916, MT7981, MT7986
- CVE-2025-20683 Memory corruption in MT6890, MT7615, MT7622, MT7663, MT7915, MT7916, MT7981, MT7986
- CVE-2025-20684 Memory corruption in MT7615, MT7622, MT7663
- CVE-2025-20674 Missing authorization in MT6890, MT6990, MT7915, MT7916, MT7981, MT7986, MT7990, MT7992, MT7993
Sources
Also known as GHSA-h372-rxq3-5q6p.