Reactor Netty HTTP Client Leaks Credentials On Protocol Downgrade Redirect
Priority LOW 26CWE-522Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-522.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00175 7th percentileScored 2026-11-07
Fix Partial Reactor Netty (Spring): 1.0.52, 1.1.36, 1.2.17.1 +1io.projectreactor.netty:reactor-netty (Maven): 1.3.6, 1.2.18Red Hat: 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| VMware | Reactor Netty | 1.0.0 to before 1.0.52; 1.1.0 to before 1.1.36; 1.2.0 to before 1.2.17.1; 1.3.0 to before 1.3.15.1 | 1.0.52, 1.1.36, 1.2.17.1, 1.3.15.1 | Patch available | CNA |
| — | io.projectreactor.netty:reactor-netty (Maven) | 1.3.0 to before 1.3.6 | 1.3.6 | Patch available | GHSA-pfc9-2cqg-9wq6 |
| — | io.projectreactor.netty:reactor-netty (Maven) | 1.2.0 to before 1.2.18 | 1.2.18 | Patch available | GHSA-pfc9-2cqg-9wq6 |
| — | io.projectreactor.netty:reactor-netty (Maven) | 1.1.0 – 1.1.31 | — | No fix listed | GHSA-pfc9-2cqg-9wq6 |
| — | io.projectreactor.netty:reactor-netty (Maven) | 1.0.0 – 1.0.48 | — | No fix listed | GHSA-pfc9-2cqg-9wq6 |
- Reactor Netty VendorVMware Affected 1.0.0 to before 1.0.52; 1.1.0 to before 1.1.36; 1.2.0 to before 1.2.17.1; 1.3.0 to before 1.3.15.1 Fixed in 1.0.52, 1.1.36, 1.2.17.1, 1.3.15.1 Patch available CNA
- io.projectreactor.netty:reactor-netty (Maven) Vendor— Affected 1.3.0 to before 1.3.6 Fixed in 1.3.6 Patch available GHSA-pfc9-2cqg-9wq6
- io.projectreactor.netty:reactor-netty (Maven) Vendor— Affected 1.2.0 to before 1.2.18 Fixed in 1.2.18 Patch available GHSA-pfc9-2cqg-9wq6
- io.projectreactor.netty:reactor-netty (Maven) Vendor— Affected 1.1.0 – 1.1.31 Fixed in — No fix listed GHSA-pfc9-2cqg-9wq6
- io.projectreactor.netty:reactor-netty (Maven) Vendor— Affected 1.0.0 – 1.0.48 Fixed in — No fix listed GHSA-pfc9-2cqg-9wq6
Remediation
- Fix · CNA Reactor Netty (Spring) Fixed in 1.0.52, 1.1.36, 1.2.17.1, 1.3.15.1
- Fix · GHSA-pfc9-2cqg-9wq6 io.projectreactor.netty:reactor-netty (Maven) Fixed in 1.3.6 Advisory →
- Fix · GHSA-pfc9-2cqg-9wq6 io.projectreactor.netty:reactor-netty (Maven) Fixed in 1.2.18 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Fuse 7 | Affected | No fix planned: Out of support scope |
| Red Hat JBoss Enterprise Application Platform Expansion Pack | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-41715
- 2026-10-03 Alias added: GHSA-pfc9-2cqg-9wq6
References
More VMware vulnerabilities
- TI-2026-42442 vCenter directory-traversal vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2024-26040 Privilege escalation in VMware vCenter Server KEVCVSS 3.1CRITICAL 9.8
- TI-2024-26039 Heap-overflow in VMware vCenter Server KEVCVSS 3.1CRITICAL 9.8
- TI-2024-24610 Out-of-bounds write in VMware vCenter Server KEVCVSS 3.1CRITICAL 9.8
- TI-2023-16914 VMware vCenter Server Out-of-Bounds Write Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2023-07303 Command injection in Aria Operations for Networks KEVCVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-41715 · CVE Program
- CVE-2026-41715 · NVD
- FIRST EPSS
- GHSA-pfc9-2cqg-9wq6 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-41715 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences