CVE-2025-57321 is a Prototype Pollution vulnerability identified in the util-deps.addFileDepend function of the magix-combine-ex library, affecting versions up to 1.2.10. Prototype Pollution vulnerabilities occur when an attacker is able to inject or modify properties on JavaScript's Object.prototype, which is the base object from which all other objects inherit properties. By supplying a crafted payload to the vulnerable function, an attacker can manipulate the prototype chain, potentially altering the behavior of the application or causing unintended side effects. In this specific case, the minimum consequence reported is a denial of service (DoS), which could manifest as application crashes, infinite loops, or resource exhaustion due to corrupted object states. The vulnerability does not currently have a CVSS score, and no known exploits are reported in the wild. The lack of a patch link suggests that either a fix is pending or not yet publicly available. The vulnerability is particularly relevant for applications or services that depend on magix-combine-ex, a JavaScript library used for module combination or dependency management, often in frontend build processes or server-side JavaScript environments. Prototype Pollution can sometimes lead to more severe impacts such as remote code execution or privilege escalation, but in this case, the documented impact is limited to DoS. However, the ability to inject properties into Object.prototype can be a stepping stone for more complex attacks if combined with other vulnerabilities or insecure coding practices.

For European organizations, the impact of this vulnerability depends largely on the extent to which magix-combine-ex is used within their software development or deployment pipelines. Organizations relying on this library for frontend or backend JavaScript module management could experience service disruptions due to DoS attacks exploiting this vulnerability. This could affect web applications, internal tools, or automated build systems, leading to downtime, degraded user experience, or delays in software delivery. While the direct confidentiality and integrity impacts appear limited, availability is clearly at risk. In sectors such as finance, healthcare, or critical infrastructure, even temporary service outages can have significant operational and reputational consequences. Additionally, if attackers combine this vulnerability with other weaknesses, there is potential for escalation beyond DoS. European organizations with complex JavaScript ecosystems or those that integrate third-party JavaScript libraries extensively should be particularly vigilant. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as public disclosure may prompt attackers to develop exploits.

1. Immediate auditing of all software projects and dependencies to identify usage of magix-combine-ex, particularly versions up to 1.2.10. 2. If magix-combine-ex is in use, isolate or sandbox affected components to limit potential impact until a patch is available. 3. Monitor official repositories and security advisories for patches or updates addressing CVE-2025-57321 and apply them promptly once released. 4. Implement input validation and sanitization on all data passed to functions that interact with object prototypes to prevent malicious payloads from being processed. 5. Employ runtime application self-protection (RASP) or behavior monitoring tools to detect anomalous prototype modifications or unusual application behavior indicative of prototype pollution attempts. 6. Conduct code reviews focusing on prototype manipulation patterns and refactor code to avoid unsafe prototype assignments. 7. Enhance logging and alerting around errors or crashes that could be symptomatic of exploitation attempts. 8. Educate development teams about prototype pollution risks and secure coding practices related to JavaScript object handling. These steps go beyond generic advice by focusing on dependency management, proactive monitoring, and secure coding tailored to the nature of prototype pollution.