Overview
The vulnerability CVE-2025-57318 is a Prototype Pollution threat in the csvjson’s toCsv function. It affects all versions up to 5.1.0. The issue is significant because it allows attackers to inject properties on Object.prototype, potentially causing denial of service (DoS) and possibly leading to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-57318
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, Potential system compromise, and Data leakage
Affected Products
Product | Affected Versions
csvjson | Up to 5.1.0
How the Exploit Works
The exploit works by taking advantage of the Prototype Pollution vulnerability in the toCsv function of csvjson. An attacker supplies a carefully crafted payload that can inject properties on Object.prototype. This injection can cause an application using the vulnerable csvjson library to behave unpredictably, leading to potential denial of service.
Conceptual Example Code
Here is a hypothetical example of a malicious payload that might exploit this vulnerability:
let payload = {
"__proto__": {
"polluted": "Prototype Polluted!"
}
};
csvjson.toCsv(payload);In this example, the payload is a JSON object that contains a “__proto__” property. When this payload is passed to the vulnerable toCsv function, it can pollute the prototype of all objects, causing unexpected behaviors in the application. This can result in a denial of service or other adverse impacts.
Mitigation Guidance
To mitigate this vulnerability, apply the vendor patch as soon as it becomes available. In the interim, use Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) to detect and block attempts to exploit this vulnerability.
