{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-47863", "assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d", "state": "PUBLISHED", "assignerShortName": "vmware", "dateReserved": "2026-05-20T10:00:55.157Z", "datePublished": "2026-08-26T23:28:48.599Z", "dateUpdated": "2026-08-26T23:28:48.599Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d", "shortName": "vmware", "dateUpdated": "2026-08-26T23:28:48.599Z"}, "title": "Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush", "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')", "type": "CWE"}]}], "impacts": [{"descriptions": [{"lang": "en", "value": "In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition."}]}], "affected": [{"vendor": "Spring", "product": "Reactor Core", "versions": [{"status": "affected", "version": "3.8.0", "lessThanOrEqual": "3.8.6", "versionType": "custom"}, {"status": "affected", "version": "0", "lessThanOrEqual": "3.7.19", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\nReactor Core 3.8.0 - 3.8.6\nReactor Core 3.7.19 and earlier", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.</p><p>Reactor Core 3.8.0 - 3.8.6<br/>Reactor Core 3.7.19 and earlier</p>"}]}], "references": [{"url": "https://spring.io/security/cve-2026-47863"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}}], "source": {"discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Reactor Core", "vendor": "Spring", "versions": [{"lessThanOrEqual": "3.8.6", "status": "affected", "version": "3.8.0", "versionType": "custom"}, {"lessThanOrEqual": "3.7.19", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\nReactor Core 3.8.0 - 3.8.6\nReactor Core 3.7.19 and earlier"}], "id": "CVE-2026-47863", "lastModified": "2026-08-27T01:17:33.467", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-08-27T01:17:33.467", "references": [{"source": "[email protected]", "url": "https://spring.io/security/cve-2026-47863"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received"}

{}

{"created": "2026-08-27T01:30:13.935594+00:00", "updated": "2026-08-27T01:30:13.935600+00:00", "vendors": [], "weaknesses": ["CWE-400"]}