{"id":"CVE-2021-23597","aliases":["EUVD-2022-1154","GHSA-qh73-qc3p-rjv2","SNYK-JS-FASTIFYMULTIPART-2395480"],"status":"published","title":"Denial of Service (DoS)","description":"This affects the package fastify-multipart before 5.3.1. By providing a name=constructor property it is still possible to crash the application. **Note:** This is a bypass of CVE-2020-8136 (https://security.snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-1290382).","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0203,"percentile":0.8132,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1321","CWE-400"],"published":"2022-02-11T17:05:13Z","modified":"2026-10-20T10:54:32Z","fixes":[{"ecosystem":"npm","package":"fastify-multipart","fixed_in":["5.3.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"fastify-multipart","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.1"}]}]},{"source":"osv","ecosystem":"npm","package":"fastify-multipart","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.3.1"}]}]}],"products":[{"vendor":"fastify","product":"fastify-multipart"}],"references":[{"url":"https://snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-2395480","tags":["x_refsource_MISC","x_transferred","Exploit","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/fastify/fastify-multipart/commit/a70dc7059a794589bd4fe066453141fc609e6066","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/fastify/fastify-multipart/releases/tag/v5.3.1","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory","web"]},{"url":"https://github.com/fastify/fastify-multipart/security/advisories/GHSA-qh73-qc3p-rjv2","tags":["web"]},{"url":"https://github.com/fastify/fastify-multipart/pull/116","tags":["web"]},{"url":"https://www.fastify.io/docs/latest/Guides/Prototype-Poisoning/"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23597","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-qh73-qc3p-rjv2"},{"url":"https://github.com/fastify/fastify-multipart","tags":["web"]},{"url":"https://www.fastify.io/docs/latest/Guides/Prototype-Poisoning","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-23597","title":"Denial of Service (DoS)","description":"This affects the package fastify-multipart before 5.3.1. By providing a name=constructor property it is still possible to crash the application. **Note:** This is a bypass of CVE-2020-8136 (https://security.snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-1290382).","status":"published","published":"2022-02-11T17:05:13.098Z","modified":"2024-09-16T16:58:20.158Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.819444Z"}],"euvd":[{"id":"EUVD-2022-1154","description":"This affects the package fastify-multipart before 5.3.1. By providing a name=constructor property it is still possible to crash the application. **Note:** This is a bypass of CVE-2020-8136 (https://security.snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-1290382).","status":"published","published":"2022-02-11T17:05:13Z","modified":"2024-09-16T16:58:20Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P","level":"high"}],"updated_at":"2026-11-03T00:55:46.745399Z"}],"ghsa":[{"id":"GHSA-qh73-qc3p-rjv2","title":"Uncaught Exception in fastify-multipart","description":"### Impact\n\nThis is a bypass of CVE-2020-8136 (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8136).\nBy providing a `name=constructor` property it is still possible to crash the application.\nThe original fix only checks for the key `__proto__` (https://github.com/fastify/fastify-multipart/pull/116).\n\nAll users are recommended to upgrade\n\n### Patches\n\nv5.3.1 includes a patch\n \n### Workarounds\n\nNo workarounds are possible.\n\n### References\n\nRead up https://www.fastify.io/docs/latest/Guides/Prototype-Poisoning/\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [https://github.com/fastify/fastify-multipart](https://github.com/fastify/fastify-multipart)\n* Email us at [hello@matteocollina.com](mailto:hello@matteocollina.com)\n","status":"published","published":"2022-02-11T18:57:53Z","modified":"2023-02-03T05:05:41Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:36:42.703723Z"}],"nvd":[{"id":"CVE-2021-23597","description":"This affects the package fastify-multipart before 5.3.1. By providing a name=constructor property it is still possible to crash the application. **Note:** This is a bypass of CVE-2020-8136 (https://security.snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-1290382).","status":"published","published":"2022-02-11T17:15:08.023Z","modified":"2026-06-17T03:38:50.523Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:07:04.6896Z"}],"osv":[{"id":"CVE-2021-23597","description":"This affects the package fastify-multipart before 5.3.1. By providing a name=constructor property it is still possible to crash the application. **Note:** This is a bypass of CVE-2020-8136 (https://security.snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-1290382).","status":"published","published":"2022-02-11T17:15:08.023Z","modified":"2026-10-20T10:54:32.540210945Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:18.778776Z"},{"id":"GHSA-qh73-qc3p-rjv2","title":"Uncaught Exception in fastify-multipart","description":"### Impact\n\nThis is a bypass of CVE-2020-8136 (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8136).\nBy providing a `name=constructor` property it is still possible to crash the application.\nThe original fix only checks for the key `__proto__` (https://github.com/fastify/fastify-multipart/pull/116).\n\nAll users are recommended to upgrade\n\n### Patches\n\nv5.3.1 includes a patch\n \n### Workarounds\n\nNo workarounds are possible.\n\n### References\n\nRead up https://www.fastify.io/docs/latest/Guides/Prototype-Poisoning/\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [https://github.com/fastify/fastify-multipart](https://github.com/fastify/fastify-multipart)\n* Email us at [hello@matteocollina.com](mailto:hello@matteocollina.com)\n","status":"published","published":"2022-02-11T18:57:53Z","modified":"2026-07-08T06:49:37.595929837Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:46:54.40888Z"}]}}