EUVD-2026-35327
GHSA-83f7-v6px-pp3h
CVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionNVD
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.
AnalysisAI
Denial of Service in Spring WebFlux's multipart request processing allows unauthenticated remote attackers to exhaust server resources across all supported Spring Framework branches. Affects Spring Framework 5.3.x through 7.0.x when applications use the reactive WebFlux stack and expose endpoints that accept multipart data. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target application must be built on the Spring WebFlux reactive stack (not Spring MVC); Spring MVC applications are not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 5.9 (Medium) is driven by AV:N (network reachable), AC:H (high attack complexity), PR:N (no privileges required), UI:N (no user interaction), and A:H (complete availability loss), with no confidentiality or integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated remote attacker identifies a Spring WebFlux application exposing a multipart form or file-upload endpoint and sends a specially crafted multipart HTTP request designed to trigger unbounded resource consumption during parsing. The application's reactive event loop becomes resource-starved - exhausting heap memory or processing capacity - causing the service to become unresponsive or crash, denying service to all legitimate users. … |
| Remediation | Upgrade to a patched Spring Framework release per the VMware/Spring vendor advisory at https://spring.io/security/cve-2026-41840. … Detailed patch versions, workarounds, and compensating controls in full report. |
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