{"id":"GHSA-gxm5-99cw-xjw9","summary":"@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name","details":"### Impact\n\n`@fastify/busboy` 3.2.1 and earlier retains a bare carriage return or line feed inside the parsed `Content-Disposition` parameters returned to the application. The multipart header parser ends a header line only on the two-byte `\\r\\n` sequence, so a lone CR or LF embedded in a part header is carried verbatim into the `filename` and field `name` delivered by the `file` and `field` events. An application that forwards the supplied filename or name into a CR/LF-sensitive sink cannot anticipate the embedded control character.\n\nAn attacker who uploads a file whose `filename` or field `name` contains a bare CR or LF can pollute filenames on disk when the upload is saved under its original name, inject forged lines into logs, or inject headers on a downstream hop that does not re-validate CR/LF, such as object-storage metadata or a proxied backend. Applications using `@fastify/busboy` directly, or through `@fastify/multipart` and its consumers, are affected.\n\n### Patches\n\nUpgrade to `@fastify/busboy` 3.2.2 or later.\n\n### Workarounds\n\nValidate or strip carriage return and line feed characters from the `filename` and field `name` before using them in any filesystem, logging, or outbound-header context.","aliases":["CVE-2026-74866"],"modified":"2026-10-05T22:45:04.558942837Z","published":"2026-10-05T22:33:44Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-10-05T22:33:44Z","nvd_published_at":"2026-08-21T09:16:40Z","cwe_ids":["CWE-93"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/fastify/busboy/security/advisories/GHSA-gxm5-99cw-xjw9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74866"},{"type":"WEB","url":"https://github.com/fastify/busboy/commit/cc7da17c5c88d79c314a9e149a79e5a00a6c23be"},{"type":"WEB","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"PACKAGE","url":"https://github.com/fastify/busboy"},{"type":"WEB","url":"https://github.com/fastify/busboy/releases/tag/v3.2.2"}],"affected":[{"package":{"name":"@fastify/busboy","ecosystem":"npm","purl":"pkg:npm/%40fastify/busboy"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.2.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-gxm5-99cw-xjw9/GHSA-gxm5-99cw-xjw9.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}]}