{"items":[{"id":"NVI-00016186","kind":"vulnerability","title":"Tornado: Quadratic DoS via Crafted Multipart Parameters","revision":2,"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-jhmp-mqwm-3gq8","CVE-2025-67726"],"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-6c6c9afbf0a0f64e78fabad85d9a4e2d"],"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":"2026-07-20T18:57:56.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-4052a537cabb7fac7003f3ae7090c001"},{"kind":"CVSS","as_of":"2026-10-07T20:10:01.970Z","value":"7.5 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-6c6c9afbf0a0f64e78fabad85d9a4e2d"}],"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-4052a537cabb7fac7003f3ae7090c001","url":"https://github.com/advisories/GHSA-jhmp-mqwm-3gq8","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-jhmp-mqwm-3gq8","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T02:49:06.528Z"},{"id":"sr-6c6c9afbf0a0f64e78fabad85d9a4e2d","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-67726","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2025-67726","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-06T15:14:24.735Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-4052a537cabb7fac7003f3ae7090c001"],"technology":"tornado","known_exclusions":[],"conditions_summary":"## Summary\n\nThe `_parseparam` function in Tornado's `httputil.py` is used to parse specific HTTP header values, such as those in `multipart/form-data`. This function uses an inefficient algorithm that repeatedly calls `string.count()` within a nested loop while processing quoted semicolons (e.g., `param=\";\"`).\n\nAs a result, if an attacker sends a request with a large number of maliciously crafted parameters in a `Content-Disposition` header, the server's CPU usage increases quadratically (O(n²)) during parsing. Due to Tornado's single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period, leading to a Denial of Service (DoS).\n\n**Severity: High**","public_affected_ranges":["< 6.5.3"]}],"null_published_at":"2026-11-08T19:53:48.744Z","source_updated_at":"2026-07-20T18:57:56.000Z","source_disclosed_at":"2026-07-20T18:57:54.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-04T02:49:06.528Z"},{"id":"NVI-00016186","kind":"vulnerability","title":"Tornado: Quadratic DoS via Crafted Multipart Parameters","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-jhmp-mqwm-3gq8","CVE-2025-67726"],"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-4052a537cabb7fac7003f3ae7090c001"],"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":"2026-07-20T18:57:56.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-4052a537cabb7fac7003f3ae7090c001"}],"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-4052a537cabb7fac7003f3ae7090c001","url":"https://github.com/advisories/GHSA-jhmp-mqwm-3gq8","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-jhmp-mqwm-3gq8","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T02:49:06.528Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-4052a537cabb7fac7003f3ae7090c001"],"technology":"tornado","known_exclusions":[],"conditions_summary":"## Summary\n\nThe `_parseparam` function in Tornado's `httputil.py` is used to parse specific HTTP header values, such as those in `multipart/form-data`. This function uses an inefficient algorithm that repeatedly calls `string.count()` within a nested loop while processing quoted semicolons (e.g., `param=\";\"`).\n\nAs a result, if an attacker sends a request with a large number of maliciously crafted parameters in a `Content-Disposition` header, the server's CPU usage increases quadratically (O(n²)) during parsing. Due to Tornado's single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period, leading to a Denial of Service (DoS).\n\n**Severity: High**","public_affected_ranges":["< 6.5.3"]}],"null_published_at":"2026-11-04T10:04:27.903Z","source_updated_at":"2026-07-20T18:57:56.000Z","source_disclosed_at":"2026-07-20T18:57:54.000Z","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":"2026-11-04T02:49:06.528Z"}],"next_cursor":null,"snapshot_revision":"42594"}