CVE-2026-22740 Spring Framework DoS with Multipart Temp Files in WebFlux
Attackers can exhaust disk space by triggering multipart request processing in Spring WebFlux, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-22740?
CVE-2026-22740 is a medium-severity denial of service vulnerability in Vmware Spring Framework, published on 29 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A WebFlux server application that processes multipart requests creates temp files for parts larger than 10 K. Under some circumstances, temp files may remain not deleted after the request is fully processed. This allows an attacker to consume available disk space.
Older, unsupported versions are also affected.
Weakness: CWE-400
Which versions are affected by CVE-2026-22740?
8 open source packages ship an affected version, including org.springframework:spring-webflux. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.springframework:spring-webflux Maven | All versions to 5.3.47 | None |
org.springframework:spring-webflux Maven | All versions to 5.3.47 | None |
org.springframework:spring-webflux Maven | From 6.1.0 to 6.1.26 | None |
org.springframework:spring-webflux Maven | From 6.1.0 to 6.1.26 | None |
org.springframework:spring-webflux Maven | From 6.2.0 | 6.2.18 |
org.springframework:spring-webflux Maven | From 6.2.0 | 6.2.18 |
2 more packages
org.springframework:spring-webflux Maven | From 7.0.0 | 7.0.7 |
org.springframework:spring-webflux Maven | From 7.0.0 | 7.0.7 |
Products include Vmware Spring Framework.
How do I fix CVE-2026-22740?
Upgrade org.springframework:spring-webflux to a fixed version for your release line: 6.2.18 or 7.0.7.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-22740 being exploited?
There is no known exploitation of CVE-2026-22740 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-KE68240, CLEANSTART-2026-RE14874, CLSA-2026-1777509594, CLSA-2026-1777509595, CLSA-2026-1778460300, CLSA-2026-1779151614 and 16 more.