Spring Security Advisories

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Reactor Netty HTTP Server Denial of Service With Pipelined Requests

MEDIUM | AUGUST 20, 2026 | CVE-2026-47874

Description

The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory.

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 and 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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