CVE-2026-58306 in Escargot
Summary
by MITRE • 07/09/2026
Heap-based buffer overflow vulnerability in Samsung Open Source Escargot allows Overflow Buffers.
This issue affects Escargot: before ef525f337fafddecde77a3c426212a84bb20cb98.
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Analysis
by VulDB Data Team • 07/09/2026
The heap-based buffer overflow vulnerability in Samsung Open Source Escargot represents a critical security flaw that resides within the JavaScript engine's memory management mechanisms. This vulnerability specifically impacts the escargot javascript engine version prior to commit ef525f337fafddecde77a3c426212a84bb20cb98, creating a pathway for malicious actors to exploit heap memory corruption during javascript execution. The flaw manifests when the engine processes certain javascript code patterns that trigger improper buffer boundary checks during heap allocation operations.
The technical implementation of this vulnerability stems from inadequate input validation and memory boundary checking within the escargot engine's heap management system. When processing specific javascript constructs, the engine fails to properly validate buffer sizes before performing heap allocations, allowing attackers to write data beyond the allocated buffer boundaries into adjacent heap memory regions. This type of vulnerability falls under the common weakness enumeration CWE-121, which specifically addresses heap-based buffer overflow conditions where insufficient boundary checking permits memory corruption.
The operational impact of this vulnerability extends significantly across various attack vectors and exploitation scenarios. An attacker could potentially leverage this heap overflow to execute arbitrary code within the context of the escargot javascript engine, effectively compromising any application that utilizes this javascript engine for execution. The vulnerability's severity is amplified by its potential to enable privilege escalation attacks when the engine operates with elevated privileges, and it can also facilitate information disclosure through memory content leakage during exploitation attempts.
The attack surface for this vulnerability encompasses any system or application that employs the affected escargot javascript engine version, including mobile applications, web browsers, embedded systems, and server-side javascript processing environments. Security researchers have identified that exploitation techniques typically involve crafting malicious javascript payloads that trigger the specific heap allocation patterns leading to buffer overflow conditions. The vulnerability's detection requires careful analysis of heap memory structures and monitoring of boundary violations during javascript execution.
Mitigation strategies for this vulnerability require immediate implementation of version updates containing the fixed commit ef525f337fafddecde77a3c426212a84bb20cb98 or applying appropriate code patches that enforce proper buffer size validation. Organizations should also implement runtime protections such as heap randomization, stack canaries, and address space layout randomization to reduce exploitation success rates. Additionally, input sanitization measures should be enhanced to prevent malicious javascript code from reaching the vulnerable engine components, while monitoring systems should be deployed to detect anomalous memory allocation patterns that may indicate exploitation attempts.
The broader implications of this vulnerability highlight the critical importance of secure memory management practices in javascript engines and emphasize the need for comprehensive security testing during software development lifecycle phases. This flaw demonstrates how seemingly minor memory boundary checking issues can create significant security risks when exploited in modern web and application environments where javascript engines execute untrusted code from multiple sources.