{"id":"CVE-2021-43801","aliases":["EUVD-2021-2420","GHSA-273r-rm8g-7f3x"],"status":"published","title":"Uncaught Exception in mercurius","description":"Mercurius is a GraphQL adapter for Fastify. Any users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler.","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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01572,"percentile":0.75578,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-754"],"published":"2021-12-13T19:30:12Z","modified":"2026-10-20T10:55:04Z","fixes":[{"ecosystem":"npm","package":"mercurius","fixed_in":["8.11.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"mercurius","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.10.0"},{"fixed":"8.11.2"}]}]},{"source":"osv","ecosystem":"npm","package":"mercurius","ranges":[{"type":"SEMVER","events":[{"introduced":"8.10.0"},{"fixed":"8.11.2"}]}]}],"products":[{"vendor":"mercurius-js","product":"mercurius"},{"vendor":"mercurius_project","product":"mercurius"}],"references":[{"url":"https://github.com/mercurius-js/mercurius/security/advisories/GHSA-273r-rm8g-7f3x","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/mercurius-js/mercurius/issues/677","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/mercurius-js/mercurius/pull/678/commits/732b2f895312da8deadd7b173dcd2d141d54b223","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43801","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-273r-rm8g-7f3x"},{"url":"https://github.com/mercurius-js/mercurius","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-43801","title":"Uncaught Exception in mercurius","description":"Mercurius is a GraphQL adapter for Fastify. Any users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler.","status":"published","published":"2021-12-13T19:30:12Z","modified":"2024-08-04T04:03:08.899Z","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":"cna"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:32:56.689433Z"}],"euvd":[{"id":"EUVD-2021-2420","description":"Mercurius is a GraphQL adapter for Fastify. Any users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler.","status":"published","published":"2021-12-13T19:30:12Z","modified":"2024-08-04T04:03:08Z","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":"2026-11-03T03:24:13.772922Z"}],"ghsa":[{"id":"GHSA-273r-rm8g-7f3x","title":"Uncaught Exception in mercurius","description":"### Impact\n\nAny users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler.\n\n### Patches\n\nThe vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2.\n\n### Workarounds\n\nUse a custom error handler.\n\n### References\n\nSee https://github.com/mercurius-js/mercurius/issues/677\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in https://github.com/mercurius-js/mercurius\n* Email us at [hello@matteocollina.com](mailto:hello@matteocollina.com)\n","status":"published","published":"2021-12-13T21:33:04Z","modified":"2023-02-01T05:07:01Z","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-754"],"updated_at":"2026-11-02T14:36:39.76883Z"}],"nvd":[{"id":"CVE-2021-43801","description":"Mercurius is a GraphQL adapter for Fastify. Any users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler.","status":"published","published":"2021-12-13T20:15:07.577Z","modified":"2026-06-17T04:11:27.953Z","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":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:07:02.189991Z"}],"osv":[{"id":"CVE-2021-43801","description":"Mercurius is a GraphQL adapter for Fastify. Any users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler.","status":"published","published":"2021-12-13T20:15:07.577Z","modified":"2026-10-20T10:55:04.321615106Z","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":"2026-11-02T15:44:21.877444Z"},{"id":"GHSA-273r-rm8g-7f3x","title":"Uncaught Exception in mercurius","description":"### Impact\n\nAny users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler.\n\n### Patches\n\nThe vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2.\n\n### Workarounds\n\nUse a custom error handler.\n\n### References\n\nSee https://github.com/mercurius-js/mercurius/issues/677\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in https://github.com/mercurius-js/mercurius\n* Email us at [hello@matteocollina.com](mailto:hello@matteocollina.com)\n","status":"published","published":"2021-12-13T21:33:04Z","modified":"2026-07-08T06:28:22.772382774Z","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-754"],"updated_at":"2026-11-02T15:46:33.956911Z"}]}}