CVE-2026-41853

Analyzed Analyzed - Analysis Complete

Multipart Request Smuggling in Spring Framework

Publication date: 2026-06-09

Last updated on: 2026-06-27

Assigner: VMware

Description

Spring MVC and WebFlux applications are vulnerable to Multipart request smuggling attacks. 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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-09

Last Modified

2026-06-27

Generated

2026-06-29

AI Q&A

2026-06-09

EPSS Evaluated

2026-06-28

NVD

CVE-2026-41853

EUVD

EUVD-2026-35342

Affected Vendors & Products

Vendor	Product	Version / Range
vmware	spring_framework	From 5.3.0 (inc) to 5.3.49 (exc)
vmware	spring_framework	From 6.1.0 (inc) to 6.1.28 (exc)
vmware	spring_framework	From 6.2.0 (inc) to 6.2.19 (exc)
vmware	spring_framework	From 7.0.0 (inc) to 7.0.8 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-444	The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

Attack-Flow Graph

Executive Summary

CVE-2026-41853 is a security vulnerability in Spring Framework versions 7.0.0 to 7.0.7, 6.2.0 to 6.2.18, 6.1.0 to 6.1.27, and 5.3.0 to 5.3.48 that affects Spring MVC and Spring WebFlux applications.

The vulnerability involves Multipart request smuggling, which happens when an application accepts Multipart requests and is protected by a Web Application Firewall (WAF) or proxy that inspects these requests.

Attackers can exploit this by sending specially crafted malicious Multipart requests that bypass the WAF or proxy checks, potentially allowing unauthorized actions.

Impact Analysis

This vulnerability can allow attackers to bypass Web Application Firewall or proxy protections by smuggling malicious Multipart requests.

By bypassing these security layers, attackers may be able to perform unauthorized actions or access parts of the application that should be protected.

The vulnerability has a medium severity rating, indicating a moderate impact if exploited.

Mitigation Strategies

Users of affected Spring Framework versions should upgrade to the fixed versions to mitigate this vulnerability.

Upgrade to Spring Framework version 7.0.8 if currently using 7.0.0 through 7.0.7.
Upgrade to Spring Framework version 6.2.19 if currently using 6.2.0 through 6.2.18.
Upgrade to Spring Framework version 6.1.28 if currently using 6.1.0 through 6.1.27.
Upgrade to Spring Framework version 5.3.49 if currently using 5.3.0 through 5.3.48.

No additional mitigation steps are required beyond upgrading.

Compliance Impact

The provided information does not specify any direct impact of the Multipart request smuggling vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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