Spring WebFlux DoS via Multipart 5.37.0.7
CVE-2026-41840 Published on June 9, 2026
Spring Framework Denial of Service via Multipart Requests in WebFlux
Spring WebFlux applications are vulnerable to Denial of Service (DoS) attacks when processing multipart requests.
Affected versions:
Spring Framework 7.0.0 through 7.0.7; 6.2.0 through 6.2.18; 6.1.0 through 6.1.27; 5.3.0 through 5.3.48.
Vulnerability Analysis
CVE-2026-41840 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-41840 has been classified to as a Resource Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-41840
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Affected Versions
Spring Framework:- Version 7.0.0 and below 7.0.8 is affected.
- Version 6.2.0 and below 6.2.19 is affected.
- Version 6.1.0 and below 6.1.28 is affected.
- Version 5.3.0 and below 5.3.49 is affected.