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PatchSiren cyber security CVE debrief

CVE-2026-41847 Spring CVE debrief

A security bypass vulnerability exists in Spring WebFlux applications when using the Kotlin Router DSL. The vulnerability affects Spring Framework versions 5.3.0 through 5.3.48.

Vendor
Spring
Product
Spring Framework
CVSS
MEDIUM 4.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-11
Advisory published
2026-06-09
Advisory updated
2026-06-11

Who should care

Users of Spring Framework versions 5.3.0 through 5.3.48 who utilize Spring WebFlux applications with the Kotlin Router DSL.

Technical summary

The vulnerability allows for a security bypass, with a CVSS score of 4.8 and a severity rating of MEDIUM. The Common Vulnerability Scoring System (CVSS) vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to Spring Framework version 5.3.49 or later.
  • Refer to the vendor advisory for more information: [ref-4](https://spring.io/security/cve-2026-41847)

Evidence notes

The CVE record and details can be found at: [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-41847) and [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-41847).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-41847 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-41847

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-41847 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-41847

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.