What’s Vulnerable › Vulnerabilities
CVE-2026-47848: Reactor Netty WebSocket Client Leaks Credentials On Redirect
- Severity: medium (CVSS 6.1 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: 2026-08-26 · updated 2026-09-04
- Weakness: CWE-601
Description
In specific scenarios involving WebSocket handshake redirects to a different origin, the Reactor Netty WebSocket client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects. 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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