{"id":"CVE-2021-36716","aliases":["EUVD-2021-2537","GHSA-j377-2x76-558h"],"status":"published","title":"Improper Input Validation in is-email","description":"A ReDoS (regular expression denial of service) flaw was found in the Segment is-email package before 1.0.1 for Node.js. An attacker that is able to provide crafted input to the isEmail(input) function may cause an application to consume an excessive amount of CPU.","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":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.0099,"percentile":0.62764,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20","CWE-400"],"published":"2021-07-14T15:37:18Z","modified":"2026-06-17T03:59:02Z","fixes":[{"ecosystem":"npm","package":"is-email","fixed_in":["1.0.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"is-email","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.1"}]}]},{"source":"osv","ecosystem":"npm","package":"is-email","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.0.1"}]}]}],"products":[{"vendor":"segment","product":"is-email"}],"references":[{"url":"https://github.com/segmentio/is-email/releases","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","web"]},{"url":"https://segment.com/docs/release_notes/2021-07-13-cve-2021-36716/","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36716","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-j377-2x76-558h"},{"url":"https://github.com/segmentio/is-email","tags":["package"]},{"url":"https://segment.com/docs/release_notes/2021-07-13-cve-2021-36716","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-36716","description":"A ReDoS (regular expression denial of service) flaw was found in the Segment is-email package before 1.0.1 for Node.js. An attacker that is able to provide crafted input to the isEmail(input) function may cause an application to consume an excessive amount of CPU.","status":"published","published":"2021-07-14T15:37:18Z","modified":"2024-08-04T01:01:59.394Z","updated_at":"2026-11-02T14:33:05.989686Z"}],"euvd":[{"id":"EUVD-2021-2537","description":"A ReDoS (regular expression denial of service) flaw was found in the Segment is-email package before 1.0.1 for Node.js. An attacker that is able to provide crafted input to the isEmail(input) function may cause an application to consume an excessive amount of CPU.","status":"published","published":"2021-07-14T15:37:18Z","modified":"2024-08-04T01:01:59Z","updated_at":"2026-11-03T03:24:29.329171Z"}],"ghsa":[{"id":"GHSA-j377-2x76-558h","title":"Improper Input Validation in is-email","description":"is-email helps validate an email address. A ReDoS (regular expression denial of service) flaw was found in the Segment is-email package before 1.0.1 for Node.js. An attacker that is able to provide crafted input to the isEmail(input) function may cause an application to consume an excessive amount of CPU.","status":"published","published":"2021-12-10T17:25:21Z","modified":"2023-02-01T05:06:10Z","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-20","CWE-400"],"updated_at":"2026-11-02T14:36:37.441118Z"}],"nvd":[{"id":"CVE-2021-36716","description":"A ReDoS (regular expression denial of service) flaw was found in the Segment is-email package before 1.0.1 for Node.js. An attacker that is able to provide crafted input to the isEmail(input) function may cause an application to consume an excessive amount of CPU.","status":"published","published":"2021-07-14T16:15:07.86Z","modified":"2026-06-17T03:59:02.49Z","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":"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-400"],"updated_at":"2026-11-02T14:06:55.747384Z"}],"osv":[{"id":"GHSA-j377-2x76-558h","title":"Improper Input Validation in is-email","description":"is-email helps validate an email address. A ReDoS (regular expression denial of service) flaw was found in the Segment is-email package before 1.0.1 for Node.js. An attacker that is able to provide crafted input to the isEmail(input) function may cause an application to consume an excessive amount of CPU.","status":"published","published":"2021-12-10T17:25:21Z","modified":"2023-11-08T04:06:15.563828Z","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-20","CWE-400"],"updated_at":"2026-11-02T15:46:49.977351Z"}]}}