{"items":[{"id":"NVI-00008879","kind":"vulnerability","title":"Tornado: Event loop blocking and excess memory use from chunked bodies with many small chunks","revision":4,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-r4j5-9xpp-3985","CVE-2026-115927"],"plain_summary":"GitHub lists this reviewed advisory for tornado. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-068a189aa7fbeefbd7d84b3546bfa1b8"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-28T22:43:51.000Z","value":"5.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-16db7a3b384e54e2a1d80d62dbf69619"},{"kind":"CVSS","as_of":"2026-10-27T15:16:32.303Z","value":"5.3 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-13312f8f1961a98d148cb8f72c841563"},{"kind":"EPSS","as_of":"2026-11-05T12:03:04.000Z","value":"0.384%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.32613. Missing scores are unknown.","source_id":"sr-068a189aa7fbeefbd7d84b3546bfa1b8"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-16db7a3b384e54e2a1d80d62dbf69619","url":"https://github.com/advisories/GHSA-r4j5-9xpp-3985","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-r4j5-9xpp-3985","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:08.420Z"},{"id":"sr-13312f8f1961a98d148cb8f72c841563","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115927","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-115927","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-03T09:59:00.529Z"},{"id":"sr-068a189aa7fbeefbd7d84b3546bfa1b8","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-115927","publisher":"FIRST EPSS","observed_at":"2026-11-06T00:24:57.632Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-16db7a3b384e54e2a1d80d62dbf69619"],"technology":"tornado","known_exclusions":[],"conditions_summary":"### Summary\n\nWhen Tornado reads an HTTP/1.1 body that uses chunked transfer encoding, it processes all chunks that have already arrived without yielding to the event loop. A client can send a body made of millions of 1-byte chunks, which blocks the event loop (and therefore every other connection served by that process) for the entire time it takes to parse the body. A body near the default `max_body_size` of 100 MB can block the process for close to a minute, and the attacker can repeat or parallelize these requests.\n\nBodies made of tiny chunks also consumed far more memory than their size: a handler that does not use `@stream_request_body` stored each chunk as a separate object, using roughly 20 times as much memory as the bytes received.\n\n### Impact\n\nAll Tornado HTTP servers are affected when they receive a request body for a handler that reads it, which includes any handler that does not reject the request before the body is read. No authentication is required. Lowering `max_body_size` reduces the maximum blocking time and memory use for each request but does not remove the issue.\n\n`SimpleAsyncHTTPClient` is affected in the same way when it reads a response from a malicious ser","public_affected_ranges":["< 6.6"]}],"null_published_at":"2026-11-08T15:11:49.401Z","source_updated_at":"2026-10-28T22:43:51.000Z","source_disclosed_at":"2026-10-28T22:43:50.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:56:08.420Z"},{"id":"NVI-00008879","kind":"vulnerability","title":"Tornado: Event loop blocking and excess memory use from chunked bodies with many small chunks","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-r4j5-9xpp-3985","CVE-2026-115927"],"plain_summary":"GitHub lists this reviewed advisory for tornado. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-8de446dcfde96c363a8a8bb1e49bb7ae"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-28T22:43:51.000Z","value":"5.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-16db7a3b384e54e2a1d80d62dbf69619"},{"kind":"CVSS","as_of":"2026-10-27T15:16:32.303Z","value":"5.3 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-13312f8f1961a98d148cb8f72c841563"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.384%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.32459. Missing scores are unknown.","source_id":"sr-8de446dcfde96c363a8a8bb1e49bb7ae"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-16db7a3b384e54e2a1d80d62dbf69619","url":"https://github.com/advisories/GHSA-r4j5-9xpp-3985","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-r4j5-9xpp-3985","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:08.420Z"},{"id":"sr-13312f8f1961a98d148cb8f72c841563","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115927","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-115927","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-03T09:59:00.529Z"},{"id":"sr-8de446dcfde96c363a8a8bb1e49bb7ae","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-115927","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.374Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-16db7a3b384e54e2a1d80d62dbf69619"],"technology":"tornado","known_exclusions":[],"conditions_summary":"### Summary\n\nWhen Tornado reads an HTTP/1.1 body that uses chunked transfer encoding, it processes all chunks that have already arrived without yielding to the event loop. A client can send a body made of millions of 1-byte chunks, which blocks the event loop (and therefore every other connection served by that process) for the entire time it takes to parse the body. A body near the default `max_body_size` of 100 MB can block the process for close to a minute, and the attacker can repeat or parallelize these requests.\n\nBodies made of tiny chunks also consumed far more memory than their size: a handler that does not use `@stream_request_body` stored each chunk as a separate object, using roughly 20 times as much memory as the bytes received.\n\n### Impact\n\nAll Tornado HTTP servers are affected when they receive a request body for a handler that reads it, which includes any handler that does not reject the request before the body is read. No authentication is required. Lowering `max_body_size` reduces the maximum blocking time and memory use for each request but does not remove the issue.\n\n`SimpleAsyncHTTPClient` is affected in the same way when it reads a response from a malicious ser","public_affected_ranges":["< 6.6"]}],"null_published_at":"2026-11-03T10:03:31.371Z","source_updated_at":"2026-10-28T22:43:51.000Z","source_disclosed_at":"2026-10-28T22:43:50.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:56:08.420Z"},{"id":"NVI-00008879","kind":"vulnerability","title":"Tornado: Event loop blocking and excess memory use from chunked bodies with many small chunks","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-r4j5-9xpp-3985","CVE-2026-115927"],"plain_summary":"GitHub lists this reviewed advisory for tornado. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-8de446dcfde96c363a8a8bb1e49bb7ae"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-28T22:43:51.000Z","value":"5.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-16db7a3b384e54e2a1d80d62dbf69619"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.384%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.32459. Missing scores are unknown.","source_id":"sr-8de446dcfde96c363a8a8bb1e49bb7ae"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-16db7a3b384e54e2a1d80d62dbf69619","url":"https://github.com/advisories/GHSA-r4j5-9xpp-3985","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-r4j5-9xpp-3985","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:08.420Z"},{"id":"sr-8de446dcfde96c363a8a8bb1e49bb7ae","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-115927","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.374Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-16db7a3b384e54e2a1d80d62dbf69619"],"technology":"tornado","known_exclusions":[],"conditions_summary":"### Summary\n\nWhen Tornado reads an HTTP/1.1 body that uses chunked transfer encoding, it processes all chunks that have already arrived without yielding to the event loop. A client can send a body made of millions of 1-byte chunks, which blocks the event loop (and therefore every other connection served by that process) for the entire time it takes to parse the body. A body near the default `max_body_size` of 100 MB can block the process for close to a minute, and the attacker can repeat or parallelize these requests.\n\nBodies made of tiny chunks also consumed far more memory than their size: a handler that does not use `@stream_request_body` stored each chunk as a separate object, using roughly 20 times as much memory as the bytes received.\n\n### Impact\n\nAll Tornado HTTP servers are affected when they receive a request body for a handler that reads it, which includes any handler that does not reject the request before the body is read. No authentication is required. Lowering `max_body_size` reduces the maximum blocking time and memory use for each request but does not remove the issue.\n\n`SimpleAsyncHTTPClient` is affected in the same way when it reads a response from a malicious ser","public_affected_ranges":["< 6.6"]}],"null_published_at":"2026-11-03T02:33:09.141Z","source_updated_at":"2026-10-28T22:43:51.000Z","source_disclosed_at":"2026-10-28T22:43:50.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:56:08.420Z"},{"id":"NVI-00008879","kind":"vulnerability","title":"Tornado: Event loop blocking and excess memory use from chunked bodies with many small chunks","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-r4j5-9xpp-3985","CVE-2026-115927"],"plain_summary":"GitHub lists this reviewed advisory for tornado. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-16db7a3b384e54e2a1d80d62dbf69619"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-28T22:43:51.000Z","value":"5.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-16db7a3b384e54e2a1d80d62dbf69619"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-16db7a3b384e54e2a1d80d62dbf69619","url":"https://github.com/advisories/GHSA-r4j5-9xpp-3985","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-r4j5-9xpp-3985","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:56:08.420Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-16db7a3b384e54e2a1d80d62dbf69619"],"technology":"tornado","known_exclusions":[],"conditions_summary":"### Summary\n\nWhen Tornado reads an HTTP/1.1 body that uses chunked transfer encoding, it processes all chunks that have already arrived without yielding to the event loop. A client can send a body made of millions of 1-byte chunks, which blocks the event loop (and therefore every other connection served by that process) for the entire time it takes to parse the body. A body near the default `max_body_size` of 100 MB can block the process for close to a minute, and the attacker can repeat or parallelize these requests.\n\nBodies made of tiny chunks also consumed far more memory than their size: a handler that does not use `@stream_request_body` stored each chunk as a separate object, using roughly 20 times as much memory as the bytes received.\n\n### Impact\n\nAll Tornado HTTP servers are affected when they receive a request body for a handler that reads it, which includes any handler that does not reject the request before the body is read. No authentication is required. Lowering `max_body_size` reduces the maximum blocking time and memory use for each request but does not remove the issue.\n\n`SimpleAsyncHTTPClient` is affected in the same way when it reads a response from a malicious ser","public_affected_ranges":["< 6.6"]}],"null_published_at":"2026-10-31T22:13:27.120Z","source_updated_at":"2026-10-28T22:43:51.000Z","source_disclosed_at":"2026-10-28T22:43:50.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:56:08.420Z"}],"next_cursor":null,"snapshot_revision":"42594"}