What is CVE-2026-20455?

CVE-2026-20455 is a high-severity vulnerability in Mediatek Mt6739, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-06-01.

How severe is CVE-2026-20455?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Mediatek Mt6739

CVE-2026-20455

In geniezone, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploi…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (2.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mediatek Mt6739
Mediatek Mt6739_firmware
Mediatek Mt6761
Mediatek Mt6761_firmware
Mediatek Mt6765
Mediatek Mt6765_firmware
Mediatek Mt6768
Mediatek Mt6768_firmware
Mediatek Mt6781
Mediatek Mt6781_firmware

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security@mediatek.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20455?: CVE-2026-20455 is a high-severity vulnerability in Mediatek Mt6739, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-06-01.
How severe is CVE-2026-20455?: High severity. CVSS v3 base score is 7.8 out of 10.