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Learn moreCVE-2026-41715: Reactor Netty HTTP Client Leaks Credentials On Protocol Downgrade Redirect
Description
In specific scenarios involving HTTP redirects from a secure to an insecure endpoint, the Reactor Netty HTTP client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects.
Affected Spring Products and Versions
Reactor Netty:
- 1.0.0 - 1.0.51
- 1.1.0 - 1.1.35
- 1.2.0 - 1.2.17
- 1.3.0 - 1.3.5
Mitigation
Users of affected versions should upgrade to the corresponding fixed version.
| Affected version(s) | Fix version | Availability |
|---|---|---|
| 1.0.x | 1.0.52 (Reactor BOM 2020.0.51) | Enterprise Support Only |
| 1.1.x | 1.1.36 (Reactor BOM 2023.0.24) | Enterprise Support Only |
| 1.2.x | 1.2.18 (Reactor BOM 2024.0.18) | OSS |
| 1.3.x | 1.3.6 (Reactor BOM 2025.0.6) | OSS |
No further mitigation steps are necessary.
Credit
The issue was identified and responsibly reported by Yu Bao ([email protected]), who works for paypal.com.
References
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Reporting a vulnerability
To report a security vulnerability for a project within the Spring portfolio, see the Security Policy
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