High severity · published Oct 5, 2026
CVE-2026-20586
In vdec, there is a possible out of bounds write due to a missing bounds check
8.8
CVSS
0.4%
EPSS
No
On KEV
Description
In vdec, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS11383899; Issue ID: MSV-9614.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MC
MediaTek chipset · MediaTek, Inc.
MT2718; MT6768; MT6769; MT6789; MT6833; MT6855; +16 more · source: vendor
MF
Mt2718 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6768 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6769 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6789 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6833 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6855 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6877 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt8186 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt8188 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt8189 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt8195 Firmware · Mediatek
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20586
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20586
www.mediatek.com
https://www.mediatek.com/product-security-bulletin/October-2026
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