CVE-2025-57320 is a Prototype Pollution vulnerability identified in the json-schema-editor-visual package, which is a tool used to provide a visual editor for JSON schemas. The vulnerability exists in the setData and deleteData functions of the package, affecting all versions up to and including 1.1.1. Prototype Pollution occurs when an attacker is able to inject or delete properties on the Object.prototype, which is the base object from which most JavaScript objects inherit. By supplying a crafted payload, an attacker can manipulate these prototype properties, potentially altering the behavior of the application or other dependent code. The primary consequence of this vulnerability is a denial of service (DoS), where the application may crash or behave unexpectedly due to the corrupted prototype chain. Although no known exploits are currently reported in the wild, the vulnerability is publicly disclosed and could be leveraged by attackers to disrupt services relying on this package. The lack of a CVSS score indicates that the vulnerability has not yet been fully assessed for severity, but the nature of prototype pollution vulnerabilities often allows for significant impact, especially in JavaScript environments where object inheritance is fundamental. The vulnerability does not require authentication or user interaction, increasing the risk of exploitation in exposed environments. No patches or fixes have been linked yet, suggesting that users of this package should be cautious and consider mitigation strategies until an official update is released.

For European organizations, the impact of this vulnerability can be significant, particularly for those relying on the json-schema-editor-visual package in their web applications, development tools, or internal systems that process JSON schemas. Prototype Pollution can lead to denial of service conditions, which may disrupt business operations, degrade user experience, or cause downtime in critical applications. In environments where this package is part of a larger software supply chain, the vulnerability could propagate risks further, potentially affecting multiple systems. Given the widespread use of JavaScript and JSON in modern web applications, organizations in sectors such as finance, healthcare, government, and critical infrastructure could face operational disruptions. Additionally, denial of service attacks can be leveraged as part of multi-stage attacks, increasing the threat landscape. The absence of known exploits currently reduces immediate risk but does not eliminate the potential for future attacks, especially as threat actors often weaponize publicly disclosed vulnerabilities over time.

To mitigate this vulnerability, European organizations should first identify all instances where json-schema-editor-visual is used within their software environments. Until an official patch is released, consider the following specific actions: 1) Implement input validation and sanitization to detect and block payloads attempting to manipulate Object.prototype properties. 2) Use JavaScript security libraries or runtime protections that can detect or prevent prototype pollution attempts. 3) Isolate or sandbox components using this package to limit the impact of potential exploitation. 4) Monitor application logs and behavior for anomalies indicative of prototype pollution attacks, such as unexpected property changes or crashes. 5) Engage with the package maintainers or community to track patch releases and apply updates promptly once available. 6) Consider replacing or temporarily removing the package if feasible, especially in critical systems, until a secure version is available. 7) Educate developers about prototype pollution risks and secure coding practices to prevent similar vulnerabilities in custom code.