{"items":[{"id":"NVI-00016238","kind":"vulnerability","title":"python-multipart: Content-Disposition parameter smuggling via RFC 2231/5987 extended parameters","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-vffw-93wf-4j4q","CVE-2026-53537"],"plain_summary":"GitHub lists this reviewed advisory for python-multipart. 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-51d7927bc66cc17854308811319f4159"],"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":"2026-07-15T22:06:53.000Z","value":"3.7 low","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-51d7927bc66cc17854308811319f4159"}],"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-51d7927bc66cc17854308811319f4159","url":"https://github.com/advisories/GHSA-vffw-93wf-4j4q","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-vffw-93wf-4j4q","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T09:59:43.724Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-51d7927bc66cc17854308811319f4159"],"technology":"python-multipart","known_exclusions":[],"conditions_summary":"### Summary\n\n`parse_options_header` parsed `Content-Disposition` (and `Content-Type`) headers with `email.message.Message`, which transparently applies RFC 2231/5987 decoding. The extended parameter syntax (`filename*=charset'lang'value`, `name*=...`, and the `filename*0`/`filename*1` continuation form) is decoded and surfaced under the bare `filename`/`name` key, and overrides the plain parameter when both are present. RFC 7578 §4.2 explicitly forbids the `filename*` form in `multipart/form-data`.\n\nComponents that follow RFC 7578, or that do not implement RFC 2231/5987 decoding for `multipart/form-data` (WAFs, proxies, gateways), may interpret such a header differently. An attacker can exploit that difference to smuggle a different field name or filename past an upstream inspector to the backend.\n\n### Details\n\nGiven both a plain and an extended parameter, the extended value won. For example:\n\n```\nContent-Disposition: form-data; name=\"comme","public_affected_ranges":["< 0.0.30"]}],"null_published_at":"2026-11-04T10:04:27.921Z","source_updated_at":"2026-07-15T22:06:53.000Z","source_disclosed_at":"2026-06-15T20:20:51.000Z","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":"2026-11-04T09:59:43.724Z"}],"next_cursor":null,"snapshot_revision":"42594"}