Heap-based Buffer Overflow in Samsung Escargot

Compliance Impact

The provided information does not specify any direct impact of the heap-based buffer overflow vulnerability in Samsung Open Source Escargot on compliance with common standards and regulations such as GDPR or HIPAA.

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Executive Summary

CVE-2026-58306 is a heap-based buffer overflow vulnerability in the Escargot JavaScript engine used by Samsung. It occurs in the interpreter component, specifically within the function that interprets JavaScript bytecode. The vulnerability arises when certain JavaScript code patterns, involving nested functions and control flow structures, cause the engine to access memory beyond the allocated heap buffer bounds. This improper memory management leads to memory corruption.

The issue was detected by AddressSanitizer during execution of a crafted JavaScript function, which triggered an out-of-bounds read. The root cause is related to how the interpreter handles bytecode generation or execution, allowing the heap buffer to overflow.

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Impact Analysis

This vulnerability can lead to memory corruption within the Escargot JavaScript engine process. The potential impacts include arbitrary code execution, where an attacker could run malicious code, or denial of service, causing the application or system using the engine to crash or become unresponsive.

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Detection Guidance

This vulnerability is triggered by specific JavaScript code patterns causing a heap buffer overflow in the Escargot JavaScript engine's interpreter. Detection involves identifying execution of vulnerable Escargot versions running such JavaScript code.

Since the issue occurs during interpretation of certain JavaScript functions with nested control flow and causes memory corruption, one detection method is to monitor for crashes or abnormal behavior in processes using Escargot.

No explicit detection commands are provided in the resources, but you can use debugging or memory error detection tools like AddressSanitizer to detect out-of-bounds memory accesses in Escargot.

• Run Escargot under AddressSanitizer to detect heap buffer overflows during JavaScript execution.
• Monitor logs and crash reports for the Escargot engine process for signs of memory corruption or crashes.

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Mitigation Strategies

The primary mitigation is to update the Escargot JavaScript engine to a version including the fix merged on June 15, 2026, which adds proper range checks to prevent the heap buffer overflow.

Until the update can be applied, avoid executing untrusted or suspicious JavaScript code that could trigger the vulnerable code paths in Escargot.

Additionally, monitor the Escargot engine for crashes or abnormal behavior that might indicate exploitation attempts.

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