Spring Security Advisories

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Reactor Netty HTTP Client Leaks Credentials On Protocol Downgrade Redirect

MEDIUM | JUNE 08, 2026 | CVE-2026-41715

Description

In specific scenarios involving HTTP redirects from a secure to an insecure endpoint, the Reactor Netty HTTP client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects.

Affected Spring Products and Versions

Reactor Netty:

  • 1.3.0 - 1.3.5
  • 1.2.0 - 1.2.17
  • 1.1.0 - 1.1.35
  • 1.0.0 - 1.0.51

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
1.3.6OSS
1.3.5.1Enterprise Support Only
1.2.18OSS
1.2.17.1Enterprise Support Only
1.1.36Enterprise Support Only
1.0.52Enterprise Support Only

No further mitigation steps are necessary.

Credit

The issue was identified and responsibly reported by Yu Bao ([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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