EUVD-2026-66824
GHSA-p9xf-3946-vr35
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable but requires explicit fairBackpressure configuration (AC:H, non-default); no auth needed, no C/I impact, availability-only DoS.
Primary rating from Vendor (vmware).
CVSS VectorVendor: vmware
Lifecycle Timeline
2DescriptionCVE.org
In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.5.0 - 3.7.19 Reactor Core 3.4.41 and earlier
AnalysisAI
Denial of Service in Spring Reactor Core affects any JVM service that uses the Flux.windowTimeout operator with the fairBackpressure option enabled, across three major release trains (3.4.x through 3.8.6). An unauthenticated network attacker can trigger resource exhaustion or stall the reactive pipeline, causing full availability loss for the affected service. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application explicitly uses the Flux.windowTimeout operator with the fairBackpressure option enabled - this is a developer-opt-in configuration that is not the default behavior of the operator. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.9 (Medium) is driven by the high attack complexity (AC:H), which meaningfully constrains real-world risk. … 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 | Upgrade Reactor Core to a patched release in the affected branch in use - the Spring security advisory at https://spring.io/security/cve-2026-47857 is the authoritative source for exact fixed versions; specific patched version numbers were not present in the input data and cannot be independently confirmed here. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Denial Of Service
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