HighFix available
node-css-what — security advisory
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.
- Products
- node-css-what
- Affected versions
- 2.0.2-1, 2.1.0-1, 3.1.0-2, 3.2.0-1, 3.2.1-1, 6.1.0-5, 6.2.2-2, 6.2.2-3
- Fixed versions
- 2.1.0-1+deb10u1build0.18.04.1, 2.1.0-1ubuntu0.16.04.1~esm1, 3.2.1-1ubuntu0.1~esm1
- CVEs
- CVE-2021-33587
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:59 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2021-33587
node-css-what
Fixed versions: 2.1.0-1ubuntu0.16.04.1~esm1
node-css-what
Fixed versions: 2.1.0-1+deb10u1build0.18.04.1
node-css-what
Fixed versions: 3.2.1-1ubuntu0.1~esm1
node-css-what
Fixed versions: Not specified
node-css-what
Fixed versions: Not specified
node-css-what
Fixed versions: Not specified
node-css-what
Fixed versions: Not specified
Complete source record
{
"id": "0a7ae35164272698b5234b3b6b53f8d60c6b9d5eda7c3cdb0e800f0218ae83af",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-33587",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2021-33587",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2021-33587",
"products": [
{
"name": {
"value": "node-css-what",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.1.0-1ubuntu0.16.04.1~esm1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "2.0.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.1.0-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/1/ranges"
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],
"affected_versions": [
{
"value": "2.1.0-1",
"evidence": "/affected/1/versions"
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},
{
"name": {
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{
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"evidence": "/affected/2/ranges"
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"affected_versions": [
{
"value": "3.1.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.2.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.2.1-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "node-css-what",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.1.0-5",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "node-css-what",
"evidence": "/affected/4/package/name"
},
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"affected_versions": [
{
"value": "6.1.0-5",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "node-css-what",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.1.0-5",
"evidence": "/affected/5/versions"
},
{
"value": "6.2.2-2",
"evidence": "/affected/5/versions"
},
{
"value": "6.2.2-3",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "node-css-what",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.1.0-5",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2021-33587",
"aliases": [
"UBUNTU-CVE-2021-33587"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.0-1ubuntu0.16.04.1~esm1"
}
]
}
],
"package": {
"name": "node-css-what",
"purl": "pkg:deb/ubuntu/node-css-what?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"2.0.2-1",
"2.1.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33587.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-css-what",
"binary_version": "2.1.0-1ubuntu0.16.04.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.0-1+deb10u1build0.18.04.1"
}
]
}
],
"package": {
"name": "node-css-what",
"purl": "pkg:deb/ubuntu/node-css-what?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"2.1.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33587.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-css-what",
"binary_version": "2.1.0-1+deb10u1build0.18.04.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.2.1-1ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "node-css-what",
"purl": "pkg:deb/ubuntu/node-css-what?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"3.1.0-2",
"3.2.0-1",
"3.2.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33587.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-css-what",
"binary_version": "3.2.1-1ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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],
"package": {
"name": "node-css-what",
"purl": "pkg:deb/ubuntu/node-css-what?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"6.1.0-5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33587.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-css-what",
"binary_version": "6.1.0-5"
}
]
}
},
{
"ranges": [
{
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],
"package": {
"name": "node-css-what",
"purl": "pkg:deb/ubuntu/node-css-what?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"6.1.0-5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33587.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-css-what",
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]
}
},
{
"ranges": [
{
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"package": {
"name": "node-css-what",
"purl": "pkg:deb/ubuntu/node-css-what?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"6.1.0-5",
"6.2.2-2",
"6.2.2-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33587.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-css-what",
"binary_version": "6.2.2-3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-css-what",
"purl": "pkg:deb/ubuntu/node-css-what?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"6.1.0-5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33587.json"
},
"ecosystem_specific": {
"binaries": [
{
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}
]
}
}
],
"modified": "2026-10-17T12:56:19.726464477Z",
"provider": "osv",
"upstream": [
"CVE-2021-33587"
],
"references": [
"https://ubuntu.com/security/CVE-2021-33587",
"https://github.com/fb55/css-what/releases/tag/v5.0.1",
"https://ubuntu.com/security/notices/USN-6065-1",
"https://www.cve.org/CVERecord?id=CVE-2021-33587"
]
},
"related_cves": [
{
"value": "CVE-2021-33587",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355287,
"published_at": "2021-05-28T20:15:00+00:00"
}