Spring Security Advisories

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Spring Framework DoS with Multipart Temp Files in WebFlux

MEDIUM | APRIL 17, 2026 | CVE-2026-22740

Description

A WebFlux server application that processes multipart requests creates temp files for parts larger than 10 K. Under some circumstances, temp files may remain not deleted after the request is fully processed. This allows an attacker to consume available disk space.

Affected Spring Products and Versions

Spring Framework:

  • 7.0.0 - 7.0.6
  • 6.2.0 - 6.2.17
  • 6.1.0 - 6.1.26
  • 5.3.47 and earlier

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
7.0.7OSS
6.2.18OSS
6.1.27Enterprise Support Only
5.3.48Enterprise Support Only

No further mitigation steps are necessary.

Credit

This vulnerability was discovered and reported independently by Xint Code and Yuki Matsuhashi.

References

History

  • 2026-04-17: Initial vulnerability report published.

Reporting a vulnerability

To report a security vulnerability for a project within the Spring portfolio, see the Security Policy

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