{"id":"GHSA-x8mw-p69m-v3mx","revision":null,"records":[{"revision":"62964e41fc5b4c619ba0c083cec21336","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-19481","aliases":[],"title":"@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header","description":"@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as __proto__ or constructor. The internal header parser stores headers in a plain JavaScript object and assumes each value is an array, so an inherited property name resolves to a truthy non-array value and triggers a TypeError. In the common pipe integration the failure surfaces as an error event, but in direct write or end usage the exception is thrown synchronously and can terminate the Node.js process, causing an unauthenticated denial of service. The issue is fixed in @fastify/busboy 3.2.1, which creates the header object with a null prototype. 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Users should upgrade to 3.2.1.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://github.com/fastify/busboy/security/advisories/GHSA-x8mw-p69m-v3mx","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-57757","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Aug 13, 2026, 8:31:25 AM","dateUpdated":"Aug 13, 2026, 2:25:29 PM"},"relatedAdvisories":[{"id":"RHSA-2026:87410","title":"Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI","vulnerabilityIds":["CVE-2024-12224","CVE-2025-14920","CVE-2025-14921","CVE-2025-14924","CVE-2025-14925","CVE-2025-14926","CVE-2025-14927","CVE-2025-14928","CVE-2025-14929","CVE-2025-14930","CVE-2025-61726","CVE-2025-61729","CVE-2026-5241","CVE-2026-5497","CVE-2026-6734","CVE-2026-8643","CVE-2026-9697","CVE-2026-11822","CVE-2026-11824","CVE-2026-12151","CVE-2026-12860","CVE-2026-15143","CVE-2026-15574","CVE-2026-15679","CVE-2026-15925","CVE-2026-16221","CVE-2026-18427","CVE-2026-18446","CVE-2026-18949","CVE-2026-19481","CVE-2026-19484","CVE-2026-19534","CVE-2026-25681","CVE-2026-25960","CVE-2026-27136","CVE-2026-28390","CVE-2026-28684","CVE-2026-31812","CVE-2026-32283","CVE-2026-33186","CVE-2026-33805","CVE-2026-33811","CVE-2026-33814","CVE-2026-34993","CVE-2026-39821","CVE-2026-39852","CVE-2026-39892","CVE-2026-40682","CVE-2026-41178","CVE-2026-42502","CVE-2026-42561","CVE-2026-44431","CVE-2026-44432","CVE-2026-44660","CVE-2026-44705","CVE-2026-45820","CVE-2026-47219","CVE-2026-48526","CVE-2026-48710","CVE-2026-48746","CVE-2026-49114","CVE-2026-49825","CVE-2026-49855","CVE-2026-50559","CVE-2026-54283","CVE-2026-54399","CVE-2026-54428","CVE-2026-55831","CVE-2026-55833","CVE-2026-56121","CVE-2026-56746","CVE-2026-56819","CVE-2026-56853","CVE-2026-56858","CVE-2026-56859","CVE-2026-56860","CVE-2026-56862","CVE-2026-58059","CVE-2026-59296","CVE-2026-59879","CVE-2026-59884","CVE-2026-59885","CVE-2026-59886","CVE-2026-59899","CVE-2026-62243","CVE-2026-62384","CVE-2026-63209","CVE-2026-63374","CVE-2026-65898","CVE-2026-65918","CVE-2026-66007","CVE-2026-67213","CVE-2026-67214","CVE-2026-67312","CVE-2026-68494","CVE-2026-68497","CVE-2026-68770","CVE-2026-69097","CVE-2026-69112","CVE-2026-69152","CVE-2026-69153","CVE-2026-69243","CVE-2026-69244","CVE-2026-71281","CVE-2026-73086","CVE-2026-73088","CVE-2026-73089","CVE-2026-73415","CVE-2026-73417","CVE-2026-73502","CVE-2026-73508","CVE-2026-73620","CVE-2026-73622","CVE-2026-73623","CVE-2026-73624","CVE-2026-73625","CVE-2026-73627","CVE-2026-73646","CVE-2026-75838","CVE-2026-75899","CVE-2026-75931","CVE-2026-75975","CVE-2026-76098","CVE-2026-76169","CVE-2026-76172","CVE-2026-76222","CVE-2026-76905","CVE-2026-77354","CVE-2026-77874","CVE-2026-78676","CVE-2026-78677","CVE-2026-78679","CVE-2026-78682","CVE-2026-79674","CVE-2026-79675","CVE-2026-80205","CVE-2026-81722","CVE-2026-81724","CVE-2026-81727","CVE-2026-82397","CVE-2026-82417","CVE-2026-84292","CVE-2026-84375","CVE-2026-84394","CVE-2026-84428","CVE-2026-84445","CVE-2026-84469","CVE-2026-84504","CVE-2026-84782","CVE-2026-84961","CVE-2026-85124","CVE-2026-85152","CVE-2026-85525","CVE-2026-86049","CVE-2026-86332","CVE-2026-87776","CVE-2026-87817","CVE-2026-87819","CVE-2026-88029","CVE-2026-88031","CVE-2026-89418","CVE-2026-89425","CVE-2026-91777","CVE-2026-91990","CVE-2026-92599","CVE-2026-93599","CVE-2026-93657","CVE-2026-93749","CVE-2026-96749","CVE-2026-102831","CVE-2026-102925","CVE-2026-102930","CVE-2026-102937","CVE-2026-102938","CVE-2026-103262","CVE-2026-104851","CVE-2026-105744"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-57757","identifiers":["EUVD-2026-57757","CVE-2026-19481","GHSA-x8mw-p69m-v3mx"]},"retained":false,"historicalAffected":[]},{"revision":"72c33dbee0894e8ba5874b4b2ee2e562","observedAt":"2026-10-25T05:17:25.909+00:00","statement":{"source":"nvd","id":"CVE-2026-19481","aliases":[],"title":"@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as __proto__ or…","description":"@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as __proto__ or constructor. The internal header parser stores headers in a plain JavaScript object and assumes each value is an array, so an inherited property name resolves to a truthy non-array value and triggers a TypeError. In the common pipe integration the failure surfaces as an error event, but in direct write or end usage the exception is thrown synchronously and can terminate the Node.js process, causing an unauthenticated denial of service. The issue is fixed in @fastify/busboy 3.2.1, which creates the header object with a null prototype. Users should upgrade to 3.2.1.","state":0,"publishedAt":"2026-08-13T09:17:12.573+00:00","modifiedAt":"2026-09-03T19:16:01.753+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/busboy/security/advisories/GHSA-x8mw-p69m-v3mx"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-19481","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-754"],"productCriteria":["cpe:2.3:a:fastify:fastify\\/busyboy:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-08-13T09:17:12.573","lastModified":"2026-09-03T19:16:01.753"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-19481","identifiers":["CVE-2026-19481"]},"retained":false,"historicalAffected":[]},{"revision":"767839d0d9b14ef1b4bbf1f7e5edca16","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-x8mw-p69m-v3mx","aliases":["CVE-2026-19481"],"title":"@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header","description":"### 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. 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