CVE-2026-58303 in Escargot
Summary
by MITRE • 07/09/2026
Stack-based buffer overflow vulnerability in Samsung Open Source Escargot allows Overflow Buffers.
This issue affects Escargot: before b30b63fc63b403907d8137da1c65aaa4521fe74e.
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Analysis
by VulDB Data Team • 07/09/2026
A stack-based buffer overflow vulnerability has been identified in Samsung's Open Source Escargot JavaScript engine, specifically affecting versions prior to commit b30b63fc63b403907d8137da1c65aaa4521fe74e. This vulnerability falls under the CWE-121 stack-based buffer overflow category and represents a critical security flaw that could enable arbitrary code execution. The issue manifests when the Escargot engine processes certain JavaScript code patterns that lead to improper bounds checking during stack memory allocation.
The technical flaw occurs due to inadequate validation of input parameters within the JavaScript engine's parsing and execution routines. When maliciously crafted JavaScript code is processed, the engine fails to properly verify buffer boundaries before performing stack operations, allowing an attacker to overwrite adjacent stack memory locations. This vulnerability is particularly dangerous because it can be exploited through web-based attacks, making it accessible via standard web browsers that utilize Escargot as their JavaScript engine. The overflow can potentially overwrite return addresses, function pointers, or other critical stack data structures, enabling attackers to redirect program execution flow.
The operational impact of this vulnerability extends beyond simple code execution, as it represents a significant threat to Samsung's ecosystem of devices and applications that rely on Escargot for JavaScript processing. Mobile devices, smart TVs, and other embedded systems running Samsung's software may be compromised if they utilize vulnerable versions of the engine. The ATT&CK framework categorizes this as a code injection technique under T1059, where adversaries leverage buffer overflow vulnerabilities to inject malicious code. This vulnerability could be leveraged by attackers to escalate privileges, install persistent backdoors, or gain unauthorized access to sensitive device functionality.
Mitigation strategies should focus on immediate patching of affected versions to commit b30b63fc63b403907d8137da1c65aaa4521fe74e and subsequent releases. Organizations should implement runtime protections such as stack canaries, address space layout randomization, and non-executable stack protections to reduce exploitability. Additionally, input validation mechanisms should be strengthened within the JavaScript engine to prevent malformed data from triggering buffer overflow conditions. Security monitoring should include detection of suspicious JavaScript patterns that could indicate exploitation attempts, while network segmentation and application whitelisting can provide additional defense-in-depth measures against potential compromise scenarios.