CVE-2024-10051 is a vulnerability classified under CWE-770 (Allocation of Resources Without Limits or Throttling) affecting shaunwei/realchar, specifically version v0.0.4. The flaw resides in the handling of multipart HTTP file upload requests, where an attacker can append additional characters (e.g., dashes) to the multipart boundary string. This malformed boundary causes the server to enter a loop processing each appended character individually, consuming excessive CPU and memory resources. Because the server does not impose limits or throttling on this processing, the resource exhaustion leads to a denial of service (DoS), rendering the service unavailable to legitimate users. The attack vector is network-based, requiring no authentication or user interaction, making it trivially exploitable remotely. The vulnerability affects all users of the service, as it impacts the core request processing logic. Although no public exploits are known at this time, the CVSS v3.0 score of 7.5 (high) reflects the significant availability impact and ease of exploitation. The lack of patch links suggests a fix may not yet be publicly available, emphasizing the need for defensive measures. This vulnerability highlights the importance of robust input validation and resource management in web application components handling multipart data.

For European organizations, this vulnerability poses a significant risk of service disruption, especially for those relying on shaunwei/realchar for file upload or related functionalities. A successful DoS attack could lead to downtime, impacting business continuity, customer trust, and potentially causing financial losses. Critical sectors such as finance, healthcare, and government that depend on uninterrupted service availability could face operational challenges. Additionally, the unauthenticated nature of the exploit means attackers can launch attacks without insider access, increasing the threat surface. If exploited at scale, it could also be used as part of a larger distributed denial of service (DDoS) campaign, amplifying its impact. The absence of known exploits currently provides a window for mitigation, but organizations must act proactively to prevent potential attacks.

1. Monitor shaunwei/realchar project repositories and security advisories for official patches and apply them promptly once available. 2. Implement strict input validation on multipart boundaries to reject malformed or suspicious characters, such as excessive dashes or unusual boundary lengths. 3. Enforce request size limits and rate limiting on file upload endpoints to prevent resource exhaustion from repeated or large requests. 4. Deploy web application firewalls (WAFs) with custom rules to detect and block anomalous multipart boundary patterns indicative of this attack. 5. Use resource monitoring and alerting to detect unusual CPU or memory usage spikes on servers running realchar. 6. Consider isolating or sandboxing the file upload handling component to limit the impact of potential DoS attempts. 7. Educate development and operations teams about this vulnerability to ensure awareness and rapid response capability.