CVE-2026-3260 is a vulnerability identified in the Undertow web server component used within the Red Hat build of Apache Camel for Spring Boot 4. The flaw arises when the server processes HTTP GET requests containing multipart/form-data content. Normally, multipart/form-data is expected in POST requests, but here, if an attacker sends a GET request with this content type, and the application uses parameter processing methods such as getParameterMap(), the server prematurely parses the multipart content and stores it on disk. This behavior occurs without any limits or throttling on resource allocation. Consequently, an attacker can craft requests that cause excessive disk and memory usage, leading to resource exhaustion. This can degrade server performance or cause it to crash, resulting in Denial of Service (DoS). The vulnerability requires no authentication or user interaction but has a high attack complexity due to the need to craft specific multipart GET requests. The CVSS v3.1 base score is 5.9, reflecting medium severity, with the vector indicating network attack vector, high complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high impact on availability. No known exploits have been reported in the wild, and no patches or fixes have been linked yet. The vulnerability affects the Red Hat build of Apache Camel for Spring Boot 4, a widely used integration framework in enterprise Java applications.

The primary impact of CVE-2026-3260 is Denial of Service due to resource exhaustion on servers running the affected Red Hat build of Apache Camel for Spring Boot 4. Organizations relying on this framework for critical integration and messaging workflows may experience service outages or degraded performance if targeted by an attacker exploiting this flaw. This can disrupt business operations, cause downtime, and potentially lead to financial losses or damage to reputation. Since the vulnerability does not affect confidentiality or integrity, data breaches or unauthorized data modification are not direct concerns. However, availability impacts can indirectly affect business continuity and customer trust. The medium severity rating suggests moderate risk, but the ease of remote exploitation without authentication increases the threat level. Enterprises with public-facing applications using this product are particularly at risk. The lack of current known exploits provides a window for mitigation before widespread attacks occur.

To mitigate CVE-2026-3260, organizations should first monitor Red Hat and Apache Camel advisories for official patches or updates addressing this vulnerability and apply them promptly once available. In the interim, implement strict input validation and filtering at the web server or application firewall level to block HTTP GET requests with multipart/form-data content types, as this is an unusual and suspicious pattern. Configure Undertow or the application to disable or limit automatic parsing of multipart content on GET requests, if possible. Employ resource limiting controls such as request size limits, connection throttling, and disk quota enforcement to prevent resource exhaustion. Logging and monitoring should be enhanced to detect abnormal multipart GET requests or spikes in resource usage. Additionally, consider isolating affected services behind reverse proxies or API gateways that can enforce stricter request validation. Conduct security testing to verify that parameter processing methods do not inadvertently trigger premature parsing of multipart content. Finally, educate development teams about secure handling of multipart requests and encourage adherence to best practices in request processing.