CVE-2026-41847: Spring Framework Security Filter Bypass in WebFlux Kotlin Router DSL

June 9, 2026 (updated July 30, 2026)

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.

References

github.com/advisories/GHSA-vqgp-pf68-6947
nvd.nist.gov/vuln/detail/CVE-2026-41847
spring.io/security/cve-2026-41847

Code Behaviors & Features

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