Samsung Open Source EUVD-2026-21819

Local attacker must execute arbitrary code or trigger specific processing within Samsung Escargot JavaScript engine (commit 97e8115ab1110bc502b4b5e4a0c689a71520d335). Requires crafted input to trigger heap-based buffer overflow during parsing/execution. No remote exploitation; local code execution context needed.

Real-world risk is MODERATE despite the 8.1 CVSS score. The high attack complexity (AC:H) indicates exploitation requires sophisticated techniques such as precise heap manipulation or race condition wins, reducing likelihood of casual exploitation. The local attack vector (AV:L) significantly limits exposure - attackers need pre-existing access to the system running Escargot, eliminating drive-by internet attacks. The Changed scope (S:C) elevates CVSS scoring as the vulnerability can impact resources beyond the vulnerable component's security context, relevant for sandboxed JavaScript engines. No EPSS data provided, but absence from CISA KEV and no public exploit code suggests no confirmed active exploitation campaigns. SSVC decision factors favor DEFER priority: exploitation status is POC (not active), automatable is NO due to AC:H complexity, technical impact is TOTAL (arbitrary code execution potential). Primary risk surfaces are Samsung smart TV/appliance environments where local access might be achieved through chained exploits or physical access scenarios. Organizations using Escargot in embedded products should prioritize patching, but internet-facing services face minimal direct exposure.

An attacker with local access to a Samsung Tizen smart TV or IoT device running vulnerable Escargot executes specially crafted JavaScript code through a local application or developer interface. The malicious script triggers the heap-based buffer overflow by causing out-of-bounds writes during JavaScript object manipulation, corrupting adjacent heap metadata structures. Through precise heap grooming techniques required by the high attack complexity, the attacker achieves control over program execution flow, escalating privileges beyond the JavaScript engine sandbox and executing arbitrary code with system-level permissions, potentially installing persistent malware or exfiltrating data from the compromised device.