EUVD-2026-66678
GHSA-7f23-wcwg-2f8r
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Network vector applies as DNS resolution affects remote routing; AC:H reflects the required multi-client/multi-resolver precondition; no confidentiality or availability impact.
Primary rating from Vendor (vmware).
CVSS VectorVendor: vmware
Lifecycle Timeline
2DescriptionCVE.org
In specific scenarios involving multiple clients with different DNS resolver configurations, Reactor Netty may incorrectly reuse a previously configured DNS resolver. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
AnalysisAI
DNS resolver isolation failure in Reactor Netty allows network-adjacent attackers to trigger incorrect DNS resolution by exploiting resolver state leakage across multiple concurrently configured HTTP clients. Affected versions span three release lines: 1.0.x through 1.0.52, 1.1.0 through 1.2.18, and 1.3.0 through 1.3.6. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target application to instantiate multiple Reactor Netty HttpClient instances with differing DNS resolver configurations within the same runtime. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.7 base score accurately reflects a low-severity issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary fix is to upgrade Reactor Netty to a patched release beyond the affected version ranges: upgrade 1.0.x users to a version above 1.0.52, 1.1.x/1.2.x users to a version above 1.2.18, and 1.3.x users to a version above 1.3.6, per the vendor advisory at https://spring.io/security/cve-2026-47843. … Detailed patch versions, workarounds, and compensating controls in full report. |
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