What’s Vulnerable › Vulnerabilities
CVE-2026-47845: Reactor Netty HTTP Server may incorrectly evaluate proxy addresses
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-27 · updated 2026-09-04
- Weakness: CWE-290
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. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
Affected products
- Spring Reactor Netty: before 1.0.53; from 1.1.0 before 1.2.19; from 1.3.0 before 1.3.6.1 — fixed in 1.0.53, 1.2.19, 1.3.6.1
How to fix
Upgrade to a fixed version: Spring Reactor Netty 1.0.53, 1.2.19, 1.3.6.1. Check the vendor advisory for mitigations.
References
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