Spring Security Advisories

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Spring Framework maxPartSize Ignored in PartEventHttpMessageReader

MEDIUM | AUGUST 20, 2026 | CVE-2026-47885

Description

The PartEventHttpMessageReader in Spring WebFlux does not enforce the maxPartSize limit when maxInMemorySize is set to -1.

PartEventHttpMessageReader is used when controller a method has an @RequestBody Flux<PartEvent> argument.

Affected Spring Products and Versions

Spring Framework:

  • 7.0.0 - 7.0.8
  • 6.2.0 - 6.2.19
  • 6.1.0 - 6.1.28

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
7.0.9OSS
7.0.8.1Enterprise Support Only
6.2.20Enterprise Support Only
6.1.29Enterprise Support Only

No further mitigation steps are necessary.

References

History

  • 2026-08-20: 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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