CVE-2026-25208: Samsung Escargot Buffer Overflow

Vendor-confirmed - CVE-2026-25208 is a high Remote Code Execution vulnerability in the Samsung Open Source Escargot JavaScript engine (commit 97e8115) that gives an unprivileged, remote attacker arbitrary memory write and potential code execution via crafted input.

Overview

An integer overflow vulnerability, tracked as CVE-2026-25208, exists in the Samsung Open Source Escargot JavaScript engine. The flaw resides in a specific development version, identified by commit hash 97e8115ab1110bc502b4b5e4a0c689a71520d335. Successful exploitation can trigger a buffer overflow, potentially allowing an attacker to corrupt memory or crash the process.

Technical Details

The vulnerability is an integer overflow within Escargot’s internal operations. By providing specially crafted input, an attacker can cause a numeric calculation to exceed its intended bounds. This overflow subsequently leads to a buffer overflow condition, where data can be written beyond the limits of an allocated memory buffer. The CVSS v3.1 base score is 8.1 (High), with the attack vector being network-based. It requires no privileges and no user interaction, though the attack complexity is rated as High.

Impact

This vulnerability affects systems or applications that integrate the vulnerable version of the Escargot engine. The primary risk is denial of service through application crashes. In more sophisticated attack scenarios, a buffer overflow could potentially be leveraged to achieve remote code execution, giving an attacker control over the affected system. While not currently listed on CISA’s Known Exploited Vulnerabilities catalog, the high severity and favorable attack vector make it a significant potential risk.

Remediation and Mitigation

The primary remediation is to update the Escargot engine to a patched version. Developers and integrators using Escargot should immediately check their source against the affected commit hash and consult the official Samsung Open Source or Escargot project repositories for security patches and updated releases.

Immediate Actions:

1. Identify Usage: Inventory applications, embedded systems, or IoT devices that may utilize the Escargot JavaScript engine.
2. Apply Patches: Once available, apply the official vendor patch without delay. Monitor relevant security channels for the patch release.
3. Network Controls: As a temporary mitigation, restrict network access to affected services or devices to trusted networks only, where feasible.

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Security Insight

This vulnerability highlights the persistent challenge of memory safety in foundational software components, even those developed by major vendors for modern environments like embedded JavaScript. Similar integer overflow flaws in other JavaScript engines have historically been prime targets for exploit chain development, particularly in browser and mobile device attacks. Its presence in Escargot underscores the critical need for rigorous memory-safe coding practices and proactive fuzzing in all stages of open-source project development, not just in end-user applications.

Further Reading

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