Spring Security Advisories

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Unbounded decompression in UnZipTransformer enables zip-bomb DoS

MEDIUM | AUGUST 20, 2026 | CVE-2026-59274

Description

The UnZipTransformer does not limit decompressed entry size or entry count when processing archives. Consequently, an attacker can send a zip archive that can exhaust JVM heap memory, causing a denial-of-service outage.

Affected Spring Products and Versions

Spring Integration:

  • 7.1.0 - 7.1.0
  • 7.0.0 - 7.0.5
  • 6.5.0 - 6.5.10
  • 6.4.0 - 6.4.12

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
7.1.0.1Enterprise Support Only
7.1.1OSS
7.0.5.1Enterprise Support Only
7.0.6OSS
6.5.11Enterprise Support Only
6.4.13Enterprise 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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