{"id":"GHSA-gxm5-99cw-xjw9","revision":"ed4df30ce5e04b9dac87984f9c3e4fa4","records":[{"revision":"ed4df30ce5e04b9dac87984f9c3e4fa4","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-gxm5-99cw-xjw9","aliases":["CVE-2026-74866"],"title":"@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name","description":"### 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.","state":0,"publishedAt":"2026-10-05T22:33:44+00:00","modifiedAt":"2026-10-05T22:45:04.5589428+00:00","affected":[{"ecosystem":"npm","name":"@fastify/busboy","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.2.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/fastify/busboy/security/advisories/GHSA-gxm5-99cw-xjw9","https://nvd.nist.gov/vuln/detail/CVE-2026-74866","https://github.com/fastify/busboy/commit/cc7da17c5c88d79c314a9e149a79e5a00a6c23be","https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/busboy","https://github.com/fastify/busboy/releases/tag/v3.2.2"],"sourceUrl":"https://github.com/advisories/GHSA-gxm5-99cw-xjw9","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-gxm5-99cw-xjw9","identifiers":["GHSA-gxm5-99cw-xjw9","CVE-2026-74866"]},"retained":false,"historicalAffected":[]}],"coverage":[]}