Spring Security Advisories

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Reactor Netty HTTP Server may incorrectly evaluate proxy addresses

MEDIUM | AUGUST 20, 2026 | CVE-2026-47845

Description

In specific scenarios, Reactor Netty HTTP Server may incorrectly evaluate the remote IP address when HAProxy Protocol is enabled. In order for this to happen, the application must be configured to use HAProxy Protocol.

Affected Spring Products and Versions

Reactor Netty:

  • 1.3.0 - 1.3.6
  • 1.1.0 - 1.2.18
  • 1.0.52 and earlier

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
1.3.7OSS
1.3.6.1Enterprise Support Only
1.2.19Enterprise Support Only
1.0.53Enterprise Support Only

No further mitigation steps are necessary.

Credit

The issue was identified internally and later responsibly reported by

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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