Spring Security Advisories

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Reactor Netty HTTP Server Leaks Exception Details

MEDIUM | AUGUST 20, 2026 | CVE-2026-47844

Description

In specific scenarios, the Reactor Netty HTTP Server may leak exception details across unrelated requests. In order for this to happen, the server must be configured with Brave Tracing.

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.

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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