CVE-2020-7707: Prototype Pollution in property-expr
Summary
CVE-2020-7707: Prototype Pollution in property-expr. Affects property-expr versions < 2.0.3. Fixed in 2.0.3. How to fix ↓
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Background
The property-expr package is an npm package used for manipulating JavaScript object properties. It provides functions for accessing and modifying object properties using dot notation or bracket notation. The package is widely used in JavaScript applications for handling object properties. However, versions before 2.0.3 are vulnerable to Prototype Pollution, a type of vulnerability that allows an attacker to modify the prototype of an object and potentially execute arbitrary code.
Vulnerability Detail
The vulnerability in property-expr arises from a lack of proper input validation in the setter function. An attacker can craft a malicious payload that, when passed to the setter function, can modify the prototype of an object. This can lead to various security issues, such as remote code execution, privilege escalation, or denial of service. The severity of this vulnerability is rated as CRITICAL with a CVSS score of 9.8.
How To Fix
Latest published version: 2.0.6 as of 23 Oct 2026
npm install property-expr@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
2.0.3
This is the first release that contains the fix.
npm install property-expr@2.0.3Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Conclusion
The property-expr package before version 2.0.3 is vulnerable to Prototype Pollution. It is crucial to update to the fixed version to mitigate the risk of potential attacks. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for property-expr →
FAQ
Prototype Pollution is a vulnerability that allows an attacker to modify the prototype of an object. By modifying the prototype, the attacker can manipulate the behavior of the object and potentially execute arbitrary code.
The consequences of this vulnerability can be severe. An attacker can exploit Prototype Pollution to execute arbitrary code, escalate privileges, or cause denial of service.
At the time of this advisory, there are no known public exploits for this vulnerability. However, it is important to update the package to the fixed version to mitigate the risk.
No, only versions before 2.0.3 are affected by this vulnerability. It is recommended to update to version 2.0.3 or later.
There are alternative packages available for manipulating object properties, such as lodash.get and dot-prop. It is recommended to evaluate these alternatives based on your specific use case and requirements.
