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CVE-2026-41853

Spring Framework: Spring Framework: Request smuggling vulnerability in Spring MVC and WebFlux

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Severity

Moderate

Red Hat Product Security

5.3

CVSS 3.1

Review impact separately from score.

Published · June 9, 2026

Updated · July 25, 2026

Description

A flaw was found in Spring MVC and WebFlux applications, components of the Spring Framework. This vulnerability allows a remote, unauthenticated attacker to perform Multipart request smuggling attacks. Such an attack can lead to a low integrity impact, potentially enabling the attacker to bypass security controls or modify data.

Statement

This Moderate-impact flaw in Spring MVC and WebFlux applications allows remote, unauthenticated attackers to conduct Multipart request smuggling. This can lead to bypassing security controls or modifying data, affecting the integrity of applications utilizing these Spring Framework components.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.

CVSS / CWE

CVSS 3.1 · 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')