Bug 2486698 (CVE-2026-41847)

Summary:	CVE-2026-41847 Spring Framework: Spring WebFlux applications: Security bypass when using Kotlin Router DSL
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	gmalinko, janstey, pdelbell, rstepani
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in Spring WebFlux applications. This vulnerability allows for a security bypass when using the Kotlin Router DSL. An attacker could exploit this to bypass security restrictions, potentially leading to unauthorized access.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-06-09 05:01:18 UTC

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.