CVE-2026-41853 Spring Framework Multipart Request Smuggling in Spring MVC and WebFlux
Attackers can exploit multipart request smuggling in Spring MVC and WebFlux to bypass security controls or manipulate request processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41853?
CVE-2026-41853 is a medium-severity vulnerability in Vmware Spring Framework, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-444
Which versions are affected by CVE-2026-41853?
16 open source packages ship an affected version, including org.springframework:spring-webflux and org.springframework:spring-webmvc. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.springframework:spring-webflux Maven | All versions to 5.3.39 | None |
org.springframework:spring-webflux Maven | All versions to 5.3.39 | None |
org.springframework:spring-webflux Maven | From 6.1.0 to 6.1.21 | None |
org.springframework:spring-webflux Maven | From 6.1.0 to 6.1.21 | None |
org.springframework:spring-webflux Maven | From 6.2.0 | 6.2.19 |
org.springframework:spring-webflux Maven | From 6.2.0 | 6.2.19 |
10 more packages
org.springframework:spring-webflux Maven | From 7.0.0 | 7.0.8 |
org.springframework:spring-webflux Maven | From 7.0.0 | 7.0.8 |
org.springframework:spring-webmvc Maven | All versions to 5.3.39 | None |
org.springframework:spring-webmvc Maven | All versions to 5.3.39 | None |
org.springframework:spring-webmvc Maven | From 6.1.0 to 6.1.21 | None |
org.springframework:spring-webmvc Maven | From 6.1.0 to 6.1.21 | None |
org.springframework:spring-webmvc Maven | From 6.2.0 | 6.2.19 |
org.springframework:spring-webmvc Maven | From 6.2.0 | 6.2.19 |
org.springframework:spring-webmvc Maven | From 7.0.0 | 7.0.8 |
org.springframework:spring-webmvc Maven | From 7.0.0 | 7.0.8 |
Products include Vmware Spring Framework.
How do I fix CVE-2026-41853?
Upgrade org.springframework:spring-webflux to a fixed version for your release line: 6.2.19 or 7.0.8.
Is CVE-2026-41853 being exploited?
There is no known exploitation of CVE-2026-41853 in the wild and no public exploit code.
Other vulnerabilities in Vmware Spring Framework
- CVE-2026-47884 Spring Framework Improper Path Limitation in XsltView
- CVE-2026-47890 Spring Framework Server Sent Event stream corruption while rendering fragments
- CVE-2026-47891 Spring Framework maxInMemorySize Bypassed in Jaxb2Decoder
- CVE-2026-47892 Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints
- CVE-2026-59313 Server Sent Event stream corruption in Spring MVC functional web framework
Sources
Also known as CLEANSTART-2026-TZ04160, CLSA-2026-1786481559, DEBIAN-CVE-2026-41853, ECHO-1a82-bc81-5689, GHSA-cjpg-rgq5-fr37, MINI-2826-jgr2-39f3 and 10 more.