CVE-2026-40447: Samsung Escargot Integer Overflow Vulnerability

CVE-2026-40447 Overview

An integer overflow or wraparound vulnerability has been identified in Samsung Open Source Escargot, a lightweight JavaScript engine designed for embedded systems and IoT devices. This vulnerability can lead to undefined behavior when integer calculations exceed their maximum representable values, potentially causing denial of service conditions.

Critical Impact

Integer overflow in Escargot JavaScript engine may result in undefined behavior, potentially leading to application crashes or denial of service on affected embedded systems and IoT devices.

Affected Products

• Samsung Escargot (commit 97e8115ab1110bc502b4b5e4a0c689a71520d335)

Discovery Timeline

• 2026-04-13 - CVE-2026-40447 published to NVD
• 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2026-40447

Vulnerability Analysis

This vulnerability is classified as CWE-190 (Integer Overflow or Wraparound). Integer overflow vulnerabilities occur when arithmetic operations produce results that exceed the storage capacity of the data type being used. In the context of Escargot, this can lead to unexpected behavior when the JavaScript engine processes specially crafted input that triggers integer calculations beyond safe boundaries.

The vulnerability requires local access and has high attack complexity, meaning exploitation is not trivial and requires specific conditions to be met. While there is no impact on confidentiality or integrity, successful exploitation can result in high availability impact, potentially causing the JavaScript engine to crash or behave unpredictably.

Root Cause

The root cause stems from improper handling of integer arithmetic operations within the Escargot JavaScript engine. When performing calculations, the engine fails to properly validate that the results remain within the bounds of the data type, leading to wraparound behavior when values exceed their maximum representable range.

Attack Vector

The attack vector is local, requiring an attacker to have local access to the system running Escargot. The attacker would need to provide specially crafted JavaScript code or input that triggers integer calculations designed to overflow. Given the high attack complexity, specific conditions must be met for successful exploitation, such as particular execution paths or memory states within the engine.

The vulnerability mechanism involves providing input that causes integer arithmetic to wrap around, leading to undefined behavior. Technical details can be found in GitHub Pull Request #1554.

Detection Methods for CVE-2026-40447

Indicators of Compromise

• Unexpected crashes or restarts of applications using the Escargot JavaScript engine
• Abnormal resource consumption patterns in embedded systems running Escargot
• Error logs indicating arithmetic exceptions or undefined behavior in JavaScript execution

Detection Strategies

• Monitor applications using Escargot for unexpected terminations or crashes
• Implement runtime integrity monitoring on embedded systems utilizing the affected JavaScript engine
• Deploy SentinelOne agents on systems running Escargot to detect anomalous process behavior

Monitoring Recommendations

• Enable verbose logging for Escargot-based applications to capture potential exploitation attempts
• Monitor system stability metrics on IoT devices running the affected JavaScript engine
• Track resource utilization patterns that may indicate denial of service conditions

How to Mitigate CVE-2026-40447

Immediate Actions Required

• Update Samsung Escargot to a version that includes the fix from GitHub Pull Request #1554
• Review and audit any custom JavaScript code executed by Escargot for potential integer overflow triggers
• Implement input validation for external data processed by the JavaScript engine

Patch Information

Samsung has addressed this vulnerability through GitHub Pull Request #1554. Organizations using Escargot should update to a commit that includes this fix. The affected commit 97e8115ab1110bc502b4b5e4a0c689a71520d335 should be upgraded to a patched version.

Workarounds

• Limit the execution of untrusted JavaScript code on systems running vulnerable versions of Escargot
• Implement sandboxing or isolation for Escargot-based applications to contain potential exploitation impact
• Consider temporarily disabling or restricting functionality that processes external input until patches can be applied