CVE-2026-20494 Information disclosure in MediaTek chipset
A missing bounds check in MediaTek chipset Wi-Fi firmware allows local attackers with System privileges to read out-of-bounds memory, disclosing sensitive information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20494?
CVE-2026-20494 is a medium-severity 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 wifi, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10960006 / BORA00155314, BORA00155001, BORA00154907; Issue ID: MSV-7570.
Weakness: CWE-125
Which versions are affected by CVE-2026-20494?
It affects 3 products.
Products include Mediatek Mt6890 Firmware, Mediatek Mt6988 Firmware, Mediatek Mt6990 Firmware.
How do I fix CVE-2026-20494?
No fix has been published for CVE-2026-20494 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20494 being exploited?
There is no known exploitation of CVE-2026-20494 in the wild and no public exploit code.
Other vulnerabilities in MediaTek, Inc. MediaTek chipset
Sources
Also known as GHSA-p939-jv8f-p7rc.