User Impersonation Affecting io.projectreactor.netty:reactor-netty-http package, versions [,1.3.7)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-IOPROJECTREACTORNETTY-19267393
- published26 Aug 2026
- disclosed20 Aug 2026
- creditSam Lightfoot
Introduced: 20 Aug 2026
NewCVE-2026-47845 (opens in a new tab)How to fix?
Upgrade io.projectreactor.netty:reactor-netty-http to version 1.3.7 or higher.
Overview
Affected versions of this package are vulnerable to User Impersonation in the evaluation of the remote IP address when the HAProxy Protocol is enabled. An attacker can bypass IP-based access controls by sending specially crafted requests.
Note: This is only exploitable if the application is configured to use the HAProxy Protocol.