CVE-2026-20521

Severity: high (CVSS 8.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-05 · updated 2026-10-08
Weakness: CWE-121

Description

In Video HAL, there is a possible escalation of privilege due to a missing bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11375674; Issue ID: MSV-9571.

Affected products

Mediatek Mt2718 Firmware: all versions
Mediatek Mt6768 Firmware: all versions
Mediatek Mt6769 Firmware: all versions
Mediatek Mt6781 Firmware: all versions
Mediatek Mt6789 Firmware: all versions
Mediatek Mt6833 Firmware: all versions
Mediatek Mt6835 Firmware: all versions
Mediatek Mt6853 Firmware: all versions
Mediatek Mt6855 Firmware: all versions
Mediatek Mt6858 Firmware: all versions
Mediatek Mt6877 Firmware: all versions
Mediatek Mt6878 Firmware: all versions
Mediatek Mt6879 Firmware: all versions
Mediatek Mt6881 Firmware: all versions
Mediatek Mt6883 Firmware: all versions
Mediatek Mt6885 Firmware: all versions
Mediatek Mt6886 Firmware: all versions
Mediatek Mt6889 Firmware: all versions
Mediatek Mt6893 Firmware: all versions
Mediatek Mt6895 Firmware: all versions
Mediatek Mt6897 Firmware: all versions
Mediatek Mt6899 Firmware: all versions
Mediatek Mt6983 Firmware: all versions
Mediatek Mt6985 Firmware: all versions
Mediatek Mt6989 Firmware: all versions
Mediatek Mt6991 Firmware: all versions
Mediatek Mt6993 Firmware: all versions
Mediatek Mt8126 Firmware: all versions
Mediatek Mt8171 Firmware: all versions
Mediatek Mt8186 Firmware: all versions

References

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

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