Reactor Netty HTTP Client Leaks Credentials On Protocol Downgrade Redirect
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 versions: Reactor Netty 1.0.0 through 1.0.51; 1.1.0 through 1.1.35; 1.2.0 through 1.2.17; 1.3.0 through 1.3.5.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | io.projectreactor.netty:reactor-netty | >= 1.3.0, < 1.3.6, >= 1.2.0, < 1.2.18, >= 1.1.0, <= 1.1.31, >= 1.0.0, <= 1.0.48 | 1.3.6, 1.2.18 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-41715
- https://github.com/reactor/reactor-netty/commit/e7ef551eead84ba465324531683fafa03ab96ee9
- https://github.com/reactor/reactor-netty
- https://github.com/reactor/reactor-netty/releases/tag/v1.2.18
- https://github.com/reactor/reactor-netty/releases/tag/v1.3.6
- https://spring.io/security/cve-2026-41715
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-522- Platform
- Java / Kotlin (Maven)
- Package
io.projectreactor.netty:reactor-netty- Disclosed
- 09.06.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-pfc9-2cqg-9wq6 - CC BY 4.0
Vulnerability history: io.projectreactor.netty:reactor-netty
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 10.2019 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 1
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
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Reactor Netty HTTP Client Leaks Credentials On Protocol Downgrade Redirect this entry
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