CVE-2026-41847 Spring Framework Security Filter Bypass in WebFlux Kotlin Router DSL
Attackers can bypass security filters in Spring WebFlux applications using the Kotlin Router DSL, potentially accessing protected resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41847?
CVE-2026-41847 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 WebFlux applications may be vulnerable to a security bypass when using the Kotlin Router DSL.
Affected versions: Spring Framework 5.3.0 through 5.3.48.
Weakness: CWE-284
Which versions are affected by CVE-2026-41847?
2 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 5.3.39 | None |
org.springframework:spring-webflux Maven | All versions to 5.3.39 | None |
Products include Vmware Spring Framework.
How do I fix CVE-2026-41847?
Upgrade to a fixed version.
Is CVE-2026-41847 being exploited?
There is no known exploitation of CVE-2026-41847 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 DEBIAN-CVE-2026-41847, GHSA-vqgp-pf68-6947, UBUNTU-CVE-2026-41847.