CVE-2024-14020 identifies a prototype pollution vulnerability in the carboneio carbone library, a NodeJS-based document generation tool. The flaw exists in the Formatter Handler component, specifically within the lib/input.js file, where an attacker can manipulate object prototype attributes improperly. Prototype pollution occurs when an attacker modifies the prototype of a base object, potentially influencing all objects inheriting from it, which can lead to unexpected behavior or security issues. However, this vulnerability requires a high level of complexity to exploit remotely, with no user interaction needed and no privileges required beyond low-level privileges. The attack's success also depends on the parent NodeJS application having a similar security flaw, limiting the scope of impact. The vulnerability is fixed in carbone version 3.5.6, which includes a patch identified by commit 04f9feb24bfca23567706392f9ad2c53bbe4134e. The CVSS 4.0 vector indicates network attack vector, high attack complexity, no privileges required, no user interaction, and low impact on confidentiality, integrity, and availability. No known exploits have been reported in the wild, and the vulnerability was published on January 7, 2026.

The impact of this vulnerability is limited due to its low CVSS score and the high complexity required for exploitation. Successful exploitation could allow an attacker to modify object prototype attributes, potentially leading to unexpected application behavior or security bypasses within the carbone library. However, since the vulnerability's exploitation depends on the parent NodeJS application also having a similar security issue, the overall risk to organizations is reduced. The confidentiality, integrity, and availability impacts are low, meaning sensitive data exposure or system disruption is unlikely. Organizations using carbone for document generation in NodeJS environments might face some risk if their applications are also vulnerable to prototype pollution. Given the niche nature of the library and the complexity of exploitation, widespread impact is expected to be minimal.

Organizations should upgrade the carbone library to version 3.5.6 or later, which contains the patch addressing this vulnerability. Additionally, developers should audit their parent NodeJS applications for prototype pollution vulnerabilities or similar security issues that could be leveraged in conjunction with this flaw. Implementing strict input validation and sanitization in the Formatter Handler component and other parts of the application can help prevent prototype pollution attacks. Employing runtime security tools that detect prototype pollution attempts and monitoring application behavior for anomalies related to object prototype manipulation are recommended. Finally, maintaining an up-to-date dependency management process and regularly applying security patches will reduce exposure to this and similar vulnerabilities.