Out-of-bounds write in MediaTek products - CVE-2026-20434
Published: March 3, 2026
Vulnerability identifier: #VU123452
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20434
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local application to execute arbitrary code.
The vulnerability exists due to a missing bounds check . A local application can execute arbitrary code.
Affected software
MT6985
MT8676
MT8675
MT8673
MT8668
MT8667
MT8666
MT6991
MT6990
MT6989T
MT6989
MT6985T
MT8678
MT6983T
MT6983
MT6980D
MT6980
MT6899
MT6897
MT6896
MT6895TT
MT6895
MT8789
MT8893
MT8883
MT8873
MT8863
MT8798
MT8795T
MT8793
MT8792
MT8791T
MT8791
MT6890
MT8788E
MT8788
MT8786
MT8781
MT8771
MT8768
MT8766R
MT8766
MT8765
MT8755
MT6769
MT6785U
MT6785T
MT6783
MT6771
MT6769Z
MT6769T
MT6769S
MT6769K
MT6789
MT6768
MT6767
MT6765T
MT6765
MT6763
MT6762M
MT6762D
MT6762
MT6761
MT6739
MT2737
MT6875T
MT6886
MT6880
MT6879
MT6878M
MT6878
MT6877TT
MT6877T
MT2735
MT6855T
MT6855
MT6835T
MT6835
MT6833P
MT6833
MT6893
MT6891
MT8797
MT6785
MT6781
MT6779
MT6889
MT6885
MT6883
MT6877
MT6875
MT6873
MT6853T
MT6853
MT8676
MT8675
MT8673
MT8668
MT8667
MT8666
MT6991
MT6990
MT6989T
MT6989
MT6985T
MT8678
MT6983T
MT6983
MT6980D
MT6980
MT6899
MT6897
MT6896
MT6895TT
MT6895
MT8789
MT8893
MT8883
MT8873
MT8863
MT8798
MT8795T
MT8793
MT8792
MT8791T
MT8791
MT6890
MT8788E
MT8788
MT8786
MT8781
MT8771
MT8768
MT8766R
MT8766
MT8765
MT8755
MT6769
MT6785U
MT6785T
MT6783
MT6771
MT6769Z
MT6769T
MT6769S
MT6769K
MT6789
MT6768
MT6767
MT6765T
MT6765
MT6763
MT6762M
MT6762D
MT6762
MT6761
MT6739
MT2737
MT6875T
MT6886
MT6880
MT6879
MT6878M
MT6878
MT6877TT
MT6877T
MT2735
MT6855T
MT6855
MT6835T
MT6835
MT6833P
MT6833
MT6893
MT6891
MT8797
MT6785
MT6781
MT6779
MT6889
MT6885
MT6883
MT6877
MT6875
MT6873
MT6853T
MT6853
How to mitigate CVE-2026-20434
Install security update from vendor's website.