CVE-2020-8125: Improper Input Validation in klona
Summary
CVE-2020-8125: Improper Input Validation in klona. Affects klona versions < 1.1.1. Fixed in 1.1.1. How to fix ↓
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Background
klona is an npm package that provides a cloning utility for JavaScript objects. It allows developers to create deep copies of objects, which can be useful in various scenarios. However, versions 1.1.0 and earlier of klona are vulnerable to an improper input validation issue. This vulnerability can be exploited through a prototype pollution attack, potentially leading to remote code execution or denial of service in applications that use klona.
Vulnerability Detail
The vulnerability in klona arises from a flaw in input validation. By manipulating the input to klona, an attacker can pollute the prototype of objects, which can have severe consequences. This can result in the execution of arbitrary code or the disruption of normal application functionality. The impact of this vulnerability depends on how klona is used within an application and the privileges it has.
How To Fix
Latest published version: 2.0.6 as of 22 Oct 2026
npm install klona@2.0.6Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
1.1.1
This is the first release that contains the fix.
npm install klona@1.1.1Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If updating the klona package is not immediately feasible, developers can consider implementing input validation and sanitization mechanisms in their own code. By carefully validating and sanitizing user input before passing it to klona, the risk of exploitation can be mitigated. Here's an example of how input validation can be performed in JavaScript:
function validateInput(input) {
if (typeof input !== 'object' || input === null) {
throw new Error('Invalid input');
}
}
Conclusion
The vulnerability in klona version 1.1.0 and earlier can be exploited through prototype pollution attacks, potentially leading to remote code execution or denial of service. It is crucial for developers to update their klona package to version 1.1.1 or later to mitigate this vulnerability. If immediate updating is not possible, implementing input validation and sanitization mechanisms can provide temporary protection. For further assistance in vulnerability remediation, contact DevNack.com.
See every vulnerability recorded for klona →
FAQ
klona is an npm package that provides a cloning utility for JavaScript objects. It allows developers to create deep copies of objects.
The vulnerability in klona is an improper input validation issue that can lead to prototype pollution attacks.
This vulnerability can result in remote code execution or denial of service in applications that use klona.
To fix this vulnerability, update the klona package to version 1.1.1 or later.
If updating the klona package is not immediately feasible, implement input validation and sanitization mechanisms in your own code.
References
Related vulnerabilities
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