CVE record · CVE-2026-20586

Out-of-bounds write in MediaTek, Inc. MediaTek chipset

CVSS 8.8 HighEPSS 0.0039 · 33rd percentile

Published by the CVE Program (CNA: MediaTek) at 5 Oct 2026, 01:39 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
MediaTek, Inc.	MediaTek chipset	affected MT6768 affected MT6769 affected MT6789 affected MT6833 affected MT6855 affected MT6877 affected MT8771 affected MT8781 affected MT8781X affected MT8786 affected MT8791T Other versions: unaffected

Identifiers: CVE-2026-20586
CNA: MediaTek
Weakness (CWE): CWE-787
Tags: MediaTek, Inc. MediaTek chipset
Memory corruption
Published: 5 Oct 2026
Updated: 30 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.8	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	ADP (CISA-ADP)

CISA KEV Not listed.
EPSS 0.0039, the 33rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 5 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

www.mediatek.com/product-security-bulletin/October-2026

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.