CVE-2026-21124: CWE-20: Improper Input Validation in Samsung Mobile Samsung Mobile Devices

This vulnerability (CVE-2026-21124) involves improper input validation in the Samsung Mobile component libsimba.heifdec.media.samsung.so, specifically when handling cover images. It affects Samsung Mobile Devices prior to the SMR Oct-2026 Release 1. The flaw could allow local attackers to execute arbitrary code due to insufficient validation of input data. The CVSS 4.0 score is 8.6, indicating high severity, with attack vector local, low attack complexity, no privileges required, and no user interaction needed. Confidentiality, integrity, and availability impacts are all high.

The vulnerability allows local attackers to potentially execute arbitrary code on affected Samsung Mobile Devices, which could lead to full compromise of the device. The high CVSS score reflects significant impact on confidentiality, integrity, and availability. However, there are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The vulnerability affects versions prior to the SMR Oct-2026 Release 1, so updating to this or later releases is likely required once official patches are available. Until then, restrict local access to trusted users only.