CVE-2025-56571 identifies a Denial of Service vulnerability in Finance.js version 4.1.0, a JavaScript library commonly used for financial calculations. The vulnerability arises from the IRR (Internal Rate of Return) function's depth parameter, which controls the recursion or iteration limit during computation. Improper handling of this parameter allows an attacker to specify values that cause excessive recursive calls or iterations, leading to uncontrolled CPU consumption. This results in application stalls or crashes, effectively denying service to legitimate users. The vulnerability does not affect confidentiality or integrity but severely impacts availability. The CVSS 3.1 score of 7.5 reflects a high severity due to the ease of remote exploitation without authentication or user interaction. No patches or known exploits are currently available, but the vulnerability is classified under CWE-834 (Excessive Iteration). Organizations using Finance.js in financial or analytical applications should be aware of this risk, as it could disrupt critical business processes. Monitoring for unusual CPU spikes and limiting input parameters can help mitigate the risk until an official patch is released.

For European organizations, the primary impact of CVE-2025-56571 is operational disruption due to Denial of Service conditions in applications relying on Finance.js for financial computations. This can affect fintech companies, banks, insurance firms, and any enterprise using the library for internal or customer-facing financial analysis tools. The unavailability of these services can lead to loss of customer trust, financial losses, and potential regulatory scrutiny, especially under stringent EU data and service availability regulations such as GDPR and NIS Directive. Since the vulnerability does not compromise data confidentiality or integrity, the risk is focused on service continuity. However, prolonged outages in financial services can cascade into broader economic impacts. The ease of exploitation without authentication increases the threat level, as attackers can remotely trigger the DoS condition. European organizations with automated financial workflows or real-time analytics are particularly vulnerable to performance degradation or crashes caused by this flaw.

1. Monitor and restrict the input values for the IRR function's depth parameter to prevent excessive recursion or iteration. Implement strict input validation and enforce maximum allowable limits. 2. Apply resource usage controls such as CPU timeouts or execution time limits on processes invoking Finance.js computations to detect and terminate runaway calculations. 3. Until an official patch is released, consider isolating or sandboxing components that use Finance.js to contain potential DoS impacts. 4. Regularly monitor application performance metrics for unusual CPU spikes or stalls that could indicate exploitation attempts. 5. Engage with Finance.js maintainers or community to track patch releases and apply updates promptly once available. 6. Conduct code reviews and testing to identify other potential recursive or iterative vulnerabilities in financial calculation modules. 7. Educate development teams about safe usage patterns for recursive functions and the risks of unbounded iteration parameters.