Vulnerability · Published Aug 26, 2026 · Assigned by vmware
CVE-2026-47845Reactor Netty HTTP Server may incorrectly evaluate proxy addresses
Medium 5.3
In plain English
A medium-severity authentication bypass by spoofing in Reactor Netty from Spring. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 77.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Spring | Reactor Netty | 1.3.0 – through 1.3.61.1.0 – through 1.2.180 – through 1.0.52 |
Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N