External risk intelligence

Samsung Escargot Resource Leak Exposure Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-25209

Samsung Escargot is an open-source JavaScript engine framework. While it may be integrated into various software components, including those that handle network traffic, it is not inherently an internet-facing service or edge gateway by design. Exposure depends entirely on how the library is implemented within a specific application, making public internet reachability possible but not a standard or required deployment pattern.

Out-of-bounds Read

Samsung Escargot

2026-03-26

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in Samsung's Escargot open-source JavaScript engine, which could lead to resource exposure. This issue arises from an out-of-bounds read, potentially allowing unauthorized access to sensitive information. The main concern is confirming relevance and exposure within your environments.

Escargot could leak resources from an out-of-bounds read.
Critical vulnerability affects Samsung's open-source JavaScript engine.
Confirm if this technology is relevant and exposed in your systems.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted input to a system using Samsung's Escargot JavaScript engine. Because no authentication or user interaction is required, an attacker could reach this component over the network. Successful exploitation could lead to the exposure of sensitive information and potentially impact the availability of the affected service.

No authentication or user interaction needed.
Specially crafted input triggers vulnerability.
Resource leak and potential denial of service.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Samsung's Escargot could lead to a resource leak. When the affected component processes specially crafted inputs, it may read beyond its intended memory boundaries. This behavior is supported when Escargot is used to process such inputs.

System memory could be leaked.
Specially crafted input processing.
Denial of service or information disclosure.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Real-World Ownership section addresses the practical steps for managing this vulnerability within an organization. Given that Samsung Escargot is a JavaScript engine framework, ownership will likely fall to teams responsible for the applications that incorporate it, such as application owners or platform teams. The immediate first step is to locate all instances of Escargot within your environment, assess their business criticality and network exposure, identify the accountable owners for those instances, and then prioritize remediation efforts based on risk.

Application owners should own the issue.
Verify where Escargot is deployed.
Plan remediation based on assessed risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is Samsung Escargot?

Samsung Escargot is an open-source JavaScript engine framework. Developers integrate it into various software applications to handle and execute JavaScript code, often within environments that process complex data or network-based inputs.

What does CWE-125 mean for CVE-2026-25209?

CWE-125 refers to an out-of-bounds read vulnerability. In the context of CVE-2026-25209, this means the Escargot engine may read memory outside of its intended buffers while processing data. This weakness can result in unauthorized access to sensitive information stored in memory or cause service instability.

How is this vulnerability triggered?

The flaw is triggered when the Escargot engine processes specially crafted input. Because the engine handles the data incorrectly, it accesses memory it should not reach. Simply having the engine installed is not enough to trigger the bug; it must actively process malicious input designed to exploit this memory boundary issue.

Is my system at risk according to Halo Surface Signal?

Risk depends on how your specific application implements the library. Halo Surface Signal notes that while Escargot is not inherently an internet-facing gateway, public reachability is possible depending on your deployment. You must determine if your application uses this engine to process inputs received directly from the network.

How do I start addressing this vulnerability?

Your first step is to identify where Escargot is used within your environment by checking application dependencies or software bills of materials. Once identified, evaluate the network accessibility of those applications and coordinate with the relevant development or platform teams to plan for updates or configuration changes.

References

github.com/Samsung/escargot/pull/1554

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.