{"id":"CVE-2021-33587","aliases":["CLSA-2026-1790414394","DEBIAN-CVE-2021-33587","DLA-3350-1","EUVD-2021-1380","GHSA-q8pj-2vqx-8ggc","ROOT-APP-NPM-CVE-2021-33587","UBUNTU-CVE-2021-33587","USN-6065-1"],"status":"published","title":"Denial of service in css-what","description":"The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.","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":"2026-11-10","score":0.02036,"percentile":0.81259,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2021-05-28T00:00:00Z","modified":"2026-10-23T18:04:50Z","fixes":[{"ecosystem":"npm","package":"css-what","fixed_in":["5.0.1"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"css-what","fixed_in":["3.3.0-tuxcare.1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"node-css-what","fixed_in":["5.0.1-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"node-css-what","fixed_in":["5.0.1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"node-css-what","fixed_in":["5.0.1-1"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"@rootio/css-what","fixed_in":["5.0.0-root.io.1"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"css-what","fixed_in":["5.0.0-aikido.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"node-css-what","fixed_in":["2.1.0-1ubuntu0.16.04.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"node-css-what","fixed_in":["2.1.0-1+deb10u1build0.18.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"node-css-what","fixed_in":["3.2.1-1ubuntu0.1~esm1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"last_affected":"5.0.0"},{"fixed":"5.0.1"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.3.0-tuxcare.0"},{"fixed":"3.3.0-tuxcare.1"}]}],"versions":["3.3.0"]},{"source":"osv","ecosystem":"Debian:12","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.1-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.1-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.1-1"}]}]},{"source":"osv","ecosystem":"Debian:10","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-1+deb10u1"}]}],"versions":["2.1.0-1"],"bundled":2},{"source":"osv","ecosystem":"npm","package":"css-what","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"5.0.1"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"@rootio/css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.0-root.io.1"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.0.0-aikido.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-1ubuntu0.16.04.1~esm1"}]}],"versions":["2.0.2-1","2.1.0-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-1+deb10u1build0.18.04.1"}]}],"versions":["2.1.0-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.1-1ubuntu0.1~esm1"}]}],"versions":["3.1.0-2","3.2.0-1","3.2.1-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.0-5"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.0-5"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.0-5","6.2.2-2","6.2.2-3"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.0-5"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-1ubuntu0.16.04.1~esm1"}]}],"versions":["2.0.2-1","2.1.0-1"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-1+deb10u1build0.18.04.1"}]}],"versions":["2.1.0-1"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"node-css-what","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.1-1ubuntu0.1~esm1"}]}],"versions":["3.1.0-2","3.2.0-1","3.2.1-1"],"bundled":2}],"products":[{"vendor":"css-what_project","product":"css-what"},{"vendor":"netapp","product":"e-series_performance_analyzer"}],"references":[{"url":"https://github.com/fb55/css-what/releases/tag/v5.0.1","tags":["x_transferred","Patch","Release Notes","Third Party Advisory","fix","web","report"]},{"url":"https://security.netapp.com/advisory/ntap-20210706-0007/","tags":["x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2023/03/msg00001.html","tags":["mailing-list","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33587","tags":["advisory"]},{"url":"https://github.com/fb55/css-what/commit/4cdaacfd0d4b6fd00614be030da0dea6c2994655","tags":["web"]},{"url":"https://github.com/advisories/GHSA-q8pj-2vqx-8ggc"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-33587","tags":["advisory"]},{"url":"https://github.com/fb55/css-what","tags":["package"]},{"url":"https://security.netapp.com/advisory/ntap-20210706-0007","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-33587","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-6065-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-33587","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2022-21222","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-33587","description":"The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.","status":"published","published":"2021-05-28T00:00:00Z","modified":"2024-08-03T23:50:43.024Z","updated_at":"2026-11-02T14:33:10.555814Z"}],"euvd":[{"id":"EUVD-2021-1380","description":"The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.","status":"published","published":"2021-05-28T00:00:00Z","modified":"2024-08-03T23:50:43Z","updated_at":"2026-11-03T03:24:34.304953Z"}],"ghsa":[{"id":"GHSA-q8pj-2vqx-8ggc","title":"Denial of service in css-what","description":"The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.","status":"published","published":"2021-06-07T22:11:39Z","modified":"2025-02-12T05:11:27Z","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":"2026-11-02T14:38:30.754382Z"}],"nvd":[{"id":"CVE-2021-33587","description":"The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.","status":"published","published":"2021-05-28T20:15:07.733Z","modified":"2026-06-17T03:54:49.983Z","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"}],"updated_at":"2026-11-02T14:06:53.987491Z"}],"osv":[{"id":"CVE-2021-33587","description":"The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear 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input.","status":"published","published":"2021-06-07T22:11:39Z","modified":"2023-11-08T04:06:05.682779Z","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"},{"id":"UBUNTU-CVE-2021-33587","description":"The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.","status":"published","published":"2021-05-28T20:15:00Z","modified":"2026-10-17T12:56:19.726464477Z","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":"2026-11-02T15:54:27.870979Z"},{"id":"CLSA-2026-1790414394","title":"TuxCare security update for css-what (1 CVE)","description":"TuxCare rebuilt css-what to address 1 CVE. Fixed in 3.3.0-tuxcare.1.","status":"published","published":"2026-09-26T09:19:54Z","modified":"2026-10-15T09:48:03.138208514Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"DLA-3350-1","title":"node-css-what - security update","status":"published","published":"2023-03-03T00:00:00Z","modified":"2026-03-09T01:20:11.200562Z","updated_at":"2026-11-02T15:46:11.734021Z"},{"id":"ROOT-APP-NPM-CVE-2021-33587","title":"CVE-2021-33587 in @rootio/css-what - Patched by Root","description":"Root has patched CVE-2021-33587 in the @rootio/css-what package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-06-17T13:02:09Z","modified":"2026-06-17T18:15:04.345102412Z","updated_at":"2026-11-02T15:53:27.362922Z"},{"id":"USN-6065-1","title":"node-css-what vulnerabilities","description":"It was discovered that css-what incorrectly handled certain inputs. If a user\nor an automated system were tricked into opening a specially crafted input\nfile, a remote attacker could possibly use this issue to cause a denial of\nservice. (CVE-2021-33587, CVE-2022-21222)\n","status":"published","published":"2023-05-10T11:13:36Z","modified":"2026-06-25T13:32:03.162261736Z","updated_at":"2026-11-02T16:58:16.738762Z"}]}}