{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-115927","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-10-23T20:21:45.108Z","datePublished":"2026-10-26T19:37:40.584Z","dateUpdated":"2026-10-27T14:18:44.227Z"},"containers":{"cna":{"title":"Tornado: Event loop blocking and excess memory use from chunked bodies with many small chunks","problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"references":[{"name":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-r4j5-9xpp-3985","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-r4j5-9xpp-3985"},{"name":"https://github.com/tornadoweb/tornado/pull/3773","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/pull/3773"},{"name":"https://github.com/tornadoweb/tornado/commit/ceab33581489751a66fba8566ad6d5960d4b01c8","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/commit/ceab33581489751a66fba8566ad6d5960d4b01c8"},{"name":"https://github.com/tornadoweb/tornado/releases/tag/v6.6.0","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/releases/tag/v6.6.0"}],"affected":[{"vendor":"tornadoweb","product":"tornado","versions":[{"version":"< 6.6.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-10-26T19:37:40.584Z"},"descriptions":[{"lang":"en","value":"Tornado is a Python web framework and asynchronous networking library. Prior to 6.6.0, Tornado decodes HTTP/1.1 chunked transfer encoding by processing body data that has already arrived without yielding to the event loop. A remote unauthenticated peer can send millions of one-byte chunks to monopolize the process event loop and stall every other connection served by that process, while lowering max_body_size only limits the duration of each request. For handlers that do not use @stream_request_body, retaining each chunk as a separate object can consume roughly twenty times the received body size, and SimpleAsyncHTTPClient has the same event-loop behavior when reading a response from a malicious server. This issue is fixed in version 6.6.0."}],"source":{"advisory":"GHSA-r4j5-9xpp-3985","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-27T13:45:56.157686Z","id":"CVE-2026-115927","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"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":"2026-10-27T14:18:44.227Z"}}]}}