Medium severity · published Aug 3, 2026
CVE-2026-20491
In med, there is a possible out of bounds write due to an incorrect bounds check
5.5
CVSS
0.1%
EPSS
No
On KEV
Description
In med, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS10981478 (Note: For MT6890, MT6990, MT6988) / AUTO00851173 (Note: For MT2735, MT2737); Issue ID: MSV-7652.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MC
MediaTek chipset · MediaTek, Inc.
MT2735; MT2737; MT6890; MT6988; MT6990 · source: vendor
MF
Mt2735 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt2737 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6890 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6988 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6990 Firmware · Mediatek
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20491
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20491
Vendor Advisory
https://www.mediatek.com/product-security-bulletin/August-2026
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