{"items":[{"id":"NVI-00013005","kind":"vulnerability","title":"@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-x8mw-p69m-v3mx","CVE-2026-19481"],"plain_summary":"GitHub lists this reviewed advisory for @fastify/busboy. 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-0784ea7dc51e8291d95bb106a364fd79"],"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":"2026-10-02T23:17:27.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-35a4490c0acaba5bc8b74dacbfc3bb84"},{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.493%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.4242. Missing scores are unknown.","source_id":"sr-0784ea7dc51e8291d95bb106a364fd79"}],"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-35a4490c0acaba5bc8b74dacbfc3bb84","url":"https://github.com/advisories/GHSA-x8mw-p69m-v3mx","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-x8mw-p69m-v3mx","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T01:39:10.636Z"},{"id":"sr-0784ea7dc51e8291d95bb106a364fd79","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-2026-19481","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.780Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-35a4490c0acaba5bc8b74dacbfc3bb84"],"technology":"@fastify/busboy","known_exclusions":[],"conditions_summary":"### Impact\n\nVersions of `@fastify/busboy` from 1.0.0 and prior to 3.2.1 are vulnerable to a Denial of Service. The multipart header parser stores part-header names on a plain JavaScript object, so a part header named `__proto__` or `constructor` resolves to an inherited value that is not an array, and the parser throws `TypeError: this.header[h].push is not a function`. Through the documented `req.pipe(busboy)` integration this surfaces as an `error` event, while direct `write()`/`end()` usage throws synchronously and can terminate the Node.js process if uncaught. The parser runs before application middleware, so any unauthenticated client that can submit multipart/form-data is affected.\n\n### Patches\n\nFixed in version 3.2.1.\n\n### Workarounds\n\nAttach an `error` listener to the Busboy stream so the parser failure is handled rather than crashing the process, and wrap direct `write()`/`end()` calls in a try/catch. Upgrading to 3.2.1 removes the failure entirely.","public_affected_ranges":[">= 1.0.0, < 3.2.1"]}],"null_published_at":"2026-11-04T10:04:41.556Z","source_updated_at":"2026-10-02T23:17:27.000Z","source_disclosed_at":"2026-10-02T23:16:36.000Z","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":"2026-11-01T01:39:10.636Z"},{"id":"NVI-00013005","kind":"vulnerability","title":"@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-x8mw-p69m-v3mx","CVE-2026-19481"],"plain_summary":"GitHub lists this reviewed advisory for @fastify/busboy. 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-35a4490c0acaba5bc8b74dacbfc3bb84"],"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":"2026-10-02T23:17:27.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-35a4490c0acaba5bc8b74dacbfc3bb84"}],"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-35a4490c0acaba5bc8b74dacbfc3bb84","url":"https://github.com/advisories/GHSA-x8mw-p69m-v3mx","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-x8mw-p69m-v3mx","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T01:39:10.636Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-35a4490c0acaba5bc8b74dacbfc3bb84"],"technology":"@fastify/busboy","known_exclusions":[],"conditions_summary":"### Impact\n\nVersions of `@fastify/busboy` from 1.0.0 and prior to 3.2.1 are vulnerable to a Denial of Service. The multipart header parser stores part-header names on a plain JavaScript object, so a part header named `__proto__` or `constructor` resolves to an inherited value that is not an array, and the parser throws `TypeError: this.header[h].push is not a function`. Through the documented `req.pipe(busboy)` integration this surfaces as an `error` event, while direct `write()`/`end()` usage throws synchronously and can terminate the Node.js process if uncaught. The parser runs before application middleware, so any unauthenticated client that can submit multipart/form-data is affected.\n\n### Patches\n\nFixed in version 3.2.1.\n\n### Workarounds\n\nAttach an `error` listener to the Busboy stream so the parser failure is handled rather than crashing the process, and wrap direct `write()`/`end()` calls in a try/catch. Upgrading to 3.2.1 removes the failure entirely.","public_affected_ranges":[">= 1.0.0, < 3.2.1"]}],"null_published_at":"2026-11-01T07:29:12.908Z","source_updated_at":"2026-10-02T23:17:27.000Z","source_disclosed_at":"2026-10-02T23:16:36.000Z","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":"2026-11-01T01:39:10.636Z"}],"next_cursor":null,"snapshot_revision":"42594"}