Input validation error in Reactor Netty - CVE-2026-47845
Published: August 28, 2026
Vulnerability identifier: #VU146289
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-47845
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to affect the integrity of IP-based access control decisions.
The vulnerability exists due to improper input validation in Reactor Netty HTTP Server HAProxy Protocol address handling when processing proxied connections. A remote attacker can send a specially crafted proxied connection to affect the integrity of IP-based access control decisions.
The issue occurs only when the application is configured to use HAProxy Protocol.
Affected software
Reactor Netty
How to mitigate CVE-2026-47845
Install security update from vendor's website.
Reactor Netty - addressed in versions 1.0.53, 1.2.19, 1.3.6.1, 1.3.7