CVE-2026-21126: CWE-20: Improper Input Validation in Samsung Mobile Samsung Mobile Devices

This vulnerability (CVE-2026-21126) arises from improper input validation in the function responsible for obtaining cover images within the library libsimba.heifdec.media.samsung.so on Samsung Mobile Devices. The flaw permits local attackers to perform out-of-bounds memory writes, potentially leading to memory corruption. The vulnerability is present in versions before the SMR Oct-2026 Release 1. The CVSS 4.0 base score is 6.9, indicating medium severity, with an attack vector of local access and no privileges required.

Successful exploitation allows a local attacker to write out-of-bounds memory, which could lead to memory corruption and potentially impact system stability or security. However, the vulnerability requires local access and does not involve user interaction or privileges, limiting the attack surface. There are no known exploits in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official patch or fix information is provided in the available data. Users should monitor Samsung Mobile advisories for updates and apply the SMR Oct-2026 Release 1 or later once available.