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PatchSiren cyber security CVE debrief

CVE-2026-41853 Spring CVE debrief

CVE-2026-41853 is a vulnerability in Spring MVC and WebFlux applications that allows for Multipart request smuggling attacks. The affected versions are Spring Framework 7.0.0 through 7.0.7, 6.2.0 through 6.2.18, 6.1.0 through 6.1.27, and 5.3.0 through 5.3.48. The CVSS score for this vulnerability is 5.3, with a severity rating of MEDIUM.

Vendor
Spring
Product
Spring Framework
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-17
Advisory published
2026-06-09
Advisory updated
2026-07-17

Who should care

Developers and administrators of Spring MVC and WebFlux applications should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by improper handling of multipart requests in Spring MVC and WebFlux applications. This allows an attacker to smuggle requests, potentially leading to security issues.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to a non-vulnerable version of Spring Framework.
  • Apply patches or updates provided by the vendor.
  • Review and update application configurations to prevent exploitation.

Evidence notes

The CVE record and NVD detail pages provide additional information on this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-41853 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-41853

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

  • CVE-2026-41853 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-41853

    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.