Executive Summary

CVE-2025-26278 is a Prototype Pollution vulnerability in the dref package version 0.1.2, specifically in the lib.set function. It allows an attacker to supply a crafted payload that modifies the global Object prototype by adding or changing properties. This manipulation can lead to unexpected behavior in applications using this library, primarily causing a Denial of Service (DoS). In some cases, if the polluted properties affect sensitive Node.js APIs like exec or eval, it could escalate to remote code execution or other injection attacks. [1]

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Impact Analysis

This vulnerability can impact you by causing a Denial of Service (DoS) in applications using the vulnerable dref library. Additionally, if the polluted prototype properties influence sensitive Node.js APIs such as exec or eval, an attacker could potentially execute arbitrary commands within your application's context, leading to remote code execution or other injection-based attacks. [1]

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Detection Guidance

Detection can be performed by checking if the global Object prototype has been polluted with unexpected properties. For example, in a Node.js environment, you can run commands to inspect the prototype chain for the presence of suspicious keys such as 'pollutedKey'. A sample command in a Node.js REPL or script would be: `console.log({}.__proto__.pollutedKey);` If this outputs the value '123' or any unexpected value, it indicates prototype pollution. Additionally, reviewing usage of the dref library version 0.1.2 and monitoring for unusual behavior or crashes related to the lib.set function can help detect exploitation attempts. [1]

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Mitigation Strategies

Immediate mitigation steps include: 1) Avoid using dref version 0.1.2 or upgrade to a patched version if available. 2) Sanitize and validate all inputs that may be passed to the lib.set function to prevent crafted payloads targeting Object.prototype. 3) If upgrading is not possible, implement runtime checks to detect and remove polluted properties from Object.prototype, such as deleting suspicious keys like 'pollutedKey'. 4) Monitor application logs for signs of Denial of Service or unexpected behavior related to prototype pollution. 5) Limit the use of sensitive Node.js APIs that could be exploited if prototype pollution occurs. [1]

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