CVE-2026-22741 Static resource cache poisoning in Spring MVC and WebFlux
Attackers can poison static resource caches in Spring MVC or WebFlux applications, causing denial of service for clients.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-22741?
CVE-2026-22741 is a low-severity denial of service vulnerability in Vmware Spring Framework, published on 29 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Spring MVC and WebFlux applications are vulnerable to cache poisoning when resolving static resources.
More precisely, an application can be vulnerable when all the following are true:
* the application is using Spring MVC or Spring WebFlux * the application is configuring the resource chain support https://docs.spring.io/spring-framework/reference/web/webmvc/mvc-config/static-resources.html#page-title with caching enabled * the application adds support for encoded resources resolution * the resource cache must be empty when the attacker has access to the application
When all the conditions above are met, the attacker can send malicious requests and poison the resource cache with resources using the wrong encoding. This can cause a denial of service by breaking the front-end application for clients.
Weakness: CWE-524
Which versions are affected by CVE-2026-22741?
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 5.3.47 | 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 |
10 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 |
org.springframework:spring-webmvc Maven | All versions to 5.3.47 | None |
org.springframework:spring-webmvc Maven | All versions to 5.3.47 | None |
org.springframework:spring-webmvc Maven | From 6.1.0 to 6.1.26 | None |
org.springframework:spring-webmvc Maven | From 6.1.0 to 6.1.26 | None |
org.springframework:spring-webmvc Maven | From 6.2.0 | 6.2.18 |
org.springframework:spring-webmvc Maven | From 6.2.0 | 6.2.18 |
org.springframework:spring-webmvc Maven | From 7.0.0 | 7.0.7 |
org.springframework:spring-webmvc Maven | From 7.0.0 | 7.0.7 |
Products include Vmware Spring Framework.
How do I fix CVE-2026-22741?
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-2026-22741 being exploited?
There is no known exploitation of CVE-2026-22741 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-SB47522, CLEANSTART-2026-UZ00182, CLSA-2026-1779324468, DEBIAN-CVE-2026-22741, ECHO-6a71-dd8f-b1aa, GHSA-wg35-8jpf-2xv3 and 11 more.