Buffer overflow in Mediatek, Inc. Mediatek Chipset

CVE-2026-20521

In Video HAL, there is a possible escalation of privilege due to a missing bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11375674; Issue ID: MSV-9571.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-20521?
CVE-2026-20521 is a high-severity vulnerability in Mediatek, Inc. Mediatek Chipset, classified under Stack-based Buffer Overflow. CVSS score: 8.4/10. Published 2026-10-05.
How severe is CVE-2026-20521?
High severity. CVSS v3 base score is 8.4 out of 10.