CVE-2025-57325 is a Prototype Pollution vulnerability identified in the 'utility.set' function of the Rollbar JavaScript package, specifically in versions 2.26.4 and earlier. Rollbar is widely used for error tracking and debugging in JavaScript applications, providing developers with real-time insights into application errors. Prototype Pollution vulnerabilities occur when an attacker is able to inject or modify properties on the Object.prototype, which is the base object from which all JavaScript objects inherit. By manipulating this prototype, an attacker can alter the behavior of all objects in the application, potentially leading to unexpected behavior or security issues. In this case, the vulnerability allows an attacker to supply a crafted payload that modifies Object.prototype properties via the utility.set function. The primary impact identified is a denial of service (DoS), which can cause the affected application to crash or become unresponsive. The CVSS score of 7.5 (high severity) reflects that the vulnerability can be exploited remotely over the network without authentication or user interaction, and it impacts availability but not confidentiality or integrity. Although no known exploits are currently reported in the wild, the vulnerability's nature and ease of exploitation make it a significant risk for applications relying on Rollbar for error tracking. No patches or fixes are currently linked, indicating that affected users should monitor for updates or consider temporary mitigations. The underlying weakness is classified under CWE-1321, which relates to improper handling of prototype pollution in JavaScript objects.

For European organizations, this vulnerability poses a risk primarily to the availability of web applications and services that incorporate the vulnerable Rollbar package. Since Rollbar is commonly used in modern JavaScript applications, including single-page applications and server-side Node.js environments, exploitation could lead to application crashes or denial of service conditions, disrupting business operations. This can affect customer-facing services, internal tools, and monitoring systems that rely on Rollbar for error reporting. The disruption could lead to loss of revenue, damage to reputation, and increased operational costs due to incident response and recovery efforts. Additionally, organizations in regulated sectors such as finance, healthcare, and critical infrastructure may face compliance challenges if service availability is impacted. While the vulnerability does not directly compromise data confidentiality or integrity, the resulting service outages could indirectly affect data processing and availability commitments under regulations like GDPR. The lack of required authentication and user interaction increases the risk of automated exploitation attempts, potentially amplifying the impact on European organizations with internet-facing applications.

To mitigate this vulnerability, European organizations should first identify all instances of the Rollbar package in their software stack, including direct and transitive dependencies. Until an official patch is released, consider the following specific actions: 1) Implement input validation and sanitization on all data passed to Rollbar's utility.set function to prevent malicious payloads from reaching the vulnerable code path. 2) Employ runtime application self-protection (RASP) or Web Application Firewall (WAF) rules to detect and block suspicious payloads indicative of prototype pollution attempts targeting Rollbar. 3) Isolate or sandbox components using Rollbar to limit the blast radius of potential DoS conditions. 4) Monitor application logs and Rollbar error reports for unusual patterns or spikes that may indicate exploitation attempts. 5) Engage with Rollbar's vendor or community to obtain updates or patches as soon as they become available and plan for prompt deployment. 6) Consider temporarily disabling or replacing Rollbar with alternative error tracking solutions if the risk and impact justify such measures. 7) Conduct security testing, including fuzzing and penetration testing focused on prototype pollution vectors, to validate the effectiveness of mitigations.