{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-47857","assignerOrgId":"dcf2e128-44bd-42ed-91e8-88f912c1401d","state":"PUBLISHED","assignerShortName":"vmware","dateReserved":"2026-05-20T10:00:55.156Z","datePublished":"2026-08-26T23:28:44.743Z","dateUpdated":"2026-08-27T15:07:38.775Z"},"containers":{"cna":{"providerMetadata":{"orgId":"dcf2e128-44bd-42ed-91e8-88f912c1401d","shortName":"vmware","dateUpdated":"2026-08-26T23:28:44.743Z"},"title":"Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around","problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-190 Integer Overflow or Wraparound","type":"CWE"}]}],"impacts":[{"descriptions":[{"lang":"en","value":"In Reactor Core, applications that use the Flux.windowTimeout 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":"3.5.0","lessThanOrEqual":"3.7.19","versionType":"custom"},{"status":"affected","version":"0","lessThanOrEqual":"3.4.41","versionType":"custom"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition.\nReactor Core 3.8.0 - 3.8.6\nReactor Core 3.5.0 - 3.7.19\nReactor Core 3.4.41 and earlier","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>In Reactor Core, applications that use the Flux.windowTimeout 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 3.5.0 - 3.7.19<br/>Reactor Core 3.4.41 and earlier</p>"}]}],"references":[{"url":"https://spring.io/security/cve-2026-47857"}],"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"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-190","lang":"en","description":"CWE-190 Integer Overflow or Wraparound"}]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-27T15:07:04.132397Z","id":"CVE-2026-47857","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-27T15:07:38.775Z"}}]}}