Heap-based buffer overflow in MediaTek products - CVE-2026-20462

Vulnerability identifier: #VU136044

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2026-20462

CWE-ID: CWE-122

Exploitation vector: Local access

Exploit availability: No public exploit available

Vendor: MediaTek

Affected software:
MT6885
MT6893
MT6889
MT6883
MT6877
MT6853
MT6781
MT8791
MT8781
MT8768
MT8766R
MT8766
MT8765
MT8696
MT8695
MT6739
MT6855
MT6833
MT6789
MT6768
MT6765
MT6761

The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to heap-based buffer overflow in the telephony component when processing input. A local user can send crafted input to cause memory corruption.

Install security update from vendor's website.