CVE-2026-47890 in Spring Framework
Summary
by MITRE • 08/27/2026
Spring MVC and WebFlux applications are vulnerable to stream corruption when using Server-Sent Events (SSE) with view fragments. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19
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Analysis
by VulDB Data Team • 08/27/2026
The vulnerability identified in the specified versions of the Spring Framework, specifically affecting Spring MVC and WebFlux applications utilizing Server-Sent Events with view fragments, represents a significant integrity issue within server-side web rendering pipelines. This flaw manifests as stream corruption, which occurs when the framework attempts to process or transmit partial HTML content via SSE channels. The underlying technical mechanism involves improper handling of character encoding and buffer management during the streaming of fragmented views. When an application sends updates through Server-Sent Events, it often relies on specific output streams that must maintain strict state consistency. In vulnerable versions ranging from 7.0.0 to 7.0.8 and 6.2.0 to 6.2.19, the internal logic fails to correctly synchronize these states when dealing with view fragments, leading to malformed data being written to the client connection. This corruption can result in truncated responses, garbled text, or complete failure of the SSE stream, thereby breaking real-time communication between the server and the browser.
From a security perspective, this vulnerability is primarily categorized under CWE-20 Improper Input Validation as it relates to the framework's inability to properly validate or sanitize the internal state during streaming operations, although it also touches upon CWE-754 Improper Check for Unusual or Exceptional Conditions regarding error handling in I/O streams. The operational impact of this flaw is predominantly related to availability and data integrity rather than direct code execution or information disclosure. Clients relying on SSE for real-time updates may experience intermittent disconnections, missing notifications, or display errors where content appears corrupted. For applications that depend heavily on continuous streaming for critical functions such as live dashboards, chat systems, or financial tickers, this can lead to significant user frustration and potential loss of trust in the application's reliability. While not a direct remote code execution vector, stream corruption could potentially be leveraged in conjunction with other vulnerabilities to cause denial-of-service conditions by exhausting server resources through repeated failed connection attempts or malformed packet processing.
Mitigation strategies for organizations utilizing these versions of Spring Framework involve immediate upgrading to patched releases where the internal streaming logic has been corrected to ensure proper state management and buffer handling during SSE operations. Developers should verify that their CI/CD pipelines include dependency scanning tools capable of detecting outdated Spring components. Additionally, implementing robust client-side error handling can help mitigate some user-facing impacts by gracefully reconnecting or displaying fallback content when stream corruption is detected. Security teams should also review application logs for patterns indicative of streaming failures to identify affected instances before applying patches. Adhering to the principle of least privilege and ensuring that SSE endpoints are properly authenticated and authorized further reduces the attack surface, although this specific vulnerability does not inherently bypass authentication mechanisms. Continuous monitoring and regular updates remain essential practices in maintaining the integrity of web applications built on the Spring ecosystem.