# 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. - **Severity:** Low 3.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L`) - **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:** Yes - **Published:** 29 Apr 2026 - **Updated:** 29 Apr 2026 - **Also known as:** CLEANSTART-2026-SB47522, CLEANSTART-2026-UZ00182, CLSA-2026-1779324468, DEBIAN-CVE-2026-22741, ECHO-6a71-dd8f-b1aa, GHSA-wg35-8jpf-2xv3, MINI-76jc-7h4h-cmr8, MINI-7mf7-p292-hpcm, MINI-cj9m-55w5-8727, MINI-g6qx-64fm-28jh, MINI-gv5h-5w2q-875m, MINI-j2pw-54h6-67j8, MINI-jgqv-27m9-h5cg, MINI-rwq8-9cvj-cmr5, MINI-v5mm-82h3-pw7w, ROOT-APP-MAVEN-CVE-2026-22741, UBUNTU-CVE-2026-22741 ## 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 (Use of Cache Containing Sensitive Information) ## 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 | Ecosystem | 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 | | `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: 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. ## 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](https://insights.sbomify.com/CVE-2026-47884/): Spring Framework Improper Path Limitation in XsltView (critical 9.8) - [CVE-2026-47890](https://insights.sbomify.com/CVE-2026-47890/): Spring Framework Server Sent Event stream corruption while rendering fragments (critical 9.8) - [CVE-2026-47891](https://insights.sbomify.com/CVE-2026-47891/): Spring Framework maxInMemorySize Bypassed in Jaxb2Decoder (critical 9.8) - [CVE-2026-47892](https://insights.sbomify.com/CVE-2026-47892/): Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints (critical 9.8) - [CVE-2026-59313](https://insights.sbomify.com/CVE-2026-59313/): Server Sent Event stream corruption in Spring MVC functional web framework (critical 9.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-22741 and fix it if it is affected. What it is: 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. Exploitation: There is no known exploitation of CVE-2026-22741 in the wild and no public exploit code. Affected packages and fixed versions: - org.springframework:spring-webflux (Maven): affected all versions up to 5.3.47; no fix listed - org.springframework:spring-webflux (Maven): affected all versions up to 5.3.47; no fix listed - org.springframework:spring-webflux (Maven): affected from 6.1.0 up to 6.1.26; no fix listed - org.springframework:spring-webflux (Maven): affected from 6.1.0 up to 6.1.26; no fix listed - org.springframework:spring-webflux (Maven): affected from 6.2.0; fixed in 6.2.18 - org.springframework:spring-webflux (Maven): affected from 6.2.0; fixed in 6.2.18 - org.springframework:spring-webflux (Maven): affected from 7.0.0; fixed in 7.0.7 - org.springframework:spring-webflux (Maven): affected from 7.0.0; fixed in 7.0.7 - org.springframework:spring-webmvc (Maven): affected all versions up to 5.3.47; no fix listed - org.springframework:spring-webmvc (Maven): affected all versions up to 5.3.47; no fix listed - org.springframework:spring-webmvc (Maven): affected from 6.1.0 up to 6.1.26; no fix listed - org.springframework:spring-webmvc (Maven): affected from 6.1.0 up to 6.1.26; no fix listed Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-22741/ (Markdown: https://insights.sbomify.com/CVE-2026-22741/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-22741 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-22741 - OSV: https://osv.dev/vulnerability/CVE-2026-22741 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-22741/ Summaries are generated and may contain mistakes; the official description above is the record.