Spring Security Advisories

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Micrometer HTTP server instrumentations DoS vulnerability

HIGH | JUNE 08, 2026 | CVE-2026-40984

Description

In Micrometer, it is possible for a user to provide specially crafted HTTP requests that may cause a denial-of-service (DoS) condition.

Specifically, an application is vulnerable when all of the following are true:

  • the application uses a vulnerable version of io.micrometer:micrometer-core, micrometer-jetty11, or micrometer-jetty12
  • one or more of the HTTP server instrumentations from these artifacts are configured and metrics are recorded through the instrumentation

Affected Spring Products and Versions

Micrometer:

  • 1.16.0 - 1.16.5
  • 1.15.0 - 1.15.11
  • 1.14.0 - 1.14.15
  • 1.13.0 - 1.13.18
  • 1.9.17 and earlier

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
1.16.6OSS
1.16.5.1Enterprise Support Only
1.15.12OSS
1.15.11.1Enterprise Support Only
1.14.16Enterprise Support Only
1.13.19Enterprise Support Only
1.9.18Enterprise Support Only

No further mitigation steps are necessary.

Credit

The issue was identified and responsibly reported by Yu Bao (@August829) - [email protected] – who works for paypal.com.

References

History

  • 2026-06-08: 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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