Spring Security Advisories

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Spring Framework maxInMemorySize Bypassed in Jaxb2Decoder

MEDIUM | AUGUST 20, 2026 | CVE-2026-47891

Description

A Spring WebFlux application that relies on the Aalto XML processor to parse XML input does not correctly enforce the maxInMemorySize limit.

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
  • 6.0.0 - 6.0.30
  • 5.3.0 - 5.3.49
  • 5.2.25 and earlier

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
6.0.31Enterprise Support Only
5.3.50Enterprise Support Only
5.2.26Enterprise 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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