{"schema":"threatline.record/2","record":{"id":"CVE-2026-19484","aliases":["GHSA-xjh9-v7x6-24jw"],"summary":"@fastify/busboy vulnerable to Denial of Service via oversized multipart boundary","details":"### Impact\n\nVersions of `@fastify/busboy` from 3.1.0 and prior to 3.2.1 are vulnerable to a Denial of Service. The vendored streaming multipart search stores its default skip distance in a `Uint8Array(256)`. A multipart boundary of exactly 252 bytes makes the search needle 256 bytes, and the table entry wraps to zero, so a crafted request keeps the search in a CPU-bound loop and stalls the Node.js event loop. An unauthenticated client can trigger this with a single small request. Applications that use `@fastify/busboy` to parse multipart/form-data, directly or through `@fastify/multipart`, are affected.\n\n### Patches\n\nFixed in version 3.2.1.\n\n### Workarounds\n\nValidate the multipart boundary before parsing and reject any boundary longer than the RFC 2046 limit of 70 characters (for example at a reverse proxy or in an onRequest hook). Upgrading to 3.2.1 removes the issue.","categories":["Frameworks"],"product":"@fastify/busboy","vendor":"@fastify/busboy","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-xjh9-v7x6-24jw","source_modified_at":"2026-10-02T23:17:29Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@fastify/busboy"},"range":">= 3.1.0, < 3.2.1"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-19484","source_modified_at":"2026-08-13T14:27:01.128Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"@fastify/busboy","vendor":"@fastify/busboy","versions":[{"lessThan":"3.2.1","status":"affected","version":"3.1.0","versionType":"semver"},{"status":"unaffected","version":"3.2.1","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-xjh9-v7x6-24jw","source_modified_at":"2026-10-02T23:30:05.674605566Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"@fastify/busboy","ecosystem":"npm","purl":"pkg:npm/%40fastify/busboy"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.1.0"},{"fixed":"3.2.1"}]}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-xjh9-v7x6-24jw","source_modified_at":"2026-10-02T23:17:29Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@fastify/busboy"},"version":"3.2.1"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-19484","source_modified_at":"2026-08-13T14:27:01.128Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"@fastify/busboy","ecosystem":null},"version":"3.2.1","basis":"first unaffected version stated in the CVE record"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-xjh9-v7x6-24jw","source_modified_at":"2026-10-02T23:30:05.674605566Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"@fastify/busboy","ecosystem":"npm","purl":"pkg:npm/%40fastify/busboy"},"version":"3.2.1"}],"cvss":7.5,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00615,"percentile":0.48806,"score_date":"2026-10-23"},"published_at":"2026-08-13T08:50:47.361Z","modified_at":"2026-10-02T23:30:05.674605566Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-xjh9-v7x6-24jw","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-02T23:17:29Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-19484","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-08-13T14:27:01.128Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-xjh9-v7x6-24jw","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-02T23:30:05.674605566Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-19484","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/fastify/busboy/security/advisories/GHSA-xjh9-v7x6-24jw"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19484","source":"GitHub Advisory Database"},{"url":"https://github.com/fastify/busboy/commit/632a237e7fb6b3b7a30e0de8fab2ee72ca5bf722","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://cna.openjsf.org/security-advisories.html"},{"url":"https://github.com/fastify/busboy/releases/tag/v3.2.1","source":"GitHub Advisory Database"},{"url":"https://github.com/advisories/GHSA-xjh9-v7x6-24jw","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-08-13T14:26:38.443138Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-02T23:30:05.674605566Z","content_hash":"d7104e1ef93e62ba48f8a1af4a81595815b9dd96cea1a90ca1e24617e00c9bdc"}}