High
Security advisory
Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-36048
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:47 UTC · Revision 1
Source evidence
Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.
osv:CVE-2020-36048
Complete source record
{
"id": "d339f2fb2617f8106050f03d8f16898c62300ac0851a3d0259d51b3d49af1061",
"url": "https://osv.dev/vulnerability/CVE-2020-36048",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-36048",
"summary": "Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.",
"evidence": "osv:CVE-2020-36048",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-36048",
"aliases": [
"CVE-2020-36048",
"GHSA-j4f2-536g-r55m"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/socketio/engine.io",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "70b1c36be112671b690736de1a24753e8ec5ba22"
},
{
"fixed": "734f9d1268840722c41219e69eb58318e0b2ac6b"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:socket:engine.io:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.0.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "734f9d1268840722c41219e69eb58318e0b2ac6b"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"3.4.0",
"3.3.2",
"3.3.1",
"3.3.0",
"3.2.1",
"3.2.0",
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"1.4.1",
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"1.2.1",
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"1.0.5",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-36048.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/socketio/socket.io",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5eaeffc8e2244b73dd13fd2562c9684ad289997b"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:socket:engine.io:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.0.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"3.1.1",
"3.1.0",
"3.0.5",
"2.3.0",
"3.0.4",
"3.0.3",
"3.0.2",
"3.0.1",
"3.0.0",
"3.0.0-rc4",
"3.0.0-rc3",
"3.0.0-rc2",
"3.0.0-rc1",
"2.2.0",
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"2.1.0",
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"2.0.2",
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-36048.json"
}
}
],
"modified": "2026-10-24T10:50:11.663354791Z",
"provider": "osv",
"references": [
"https://github.com/bcaller/kill-engine-io",
"https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b",
"https://blog.caller.xyz/socketio-engineio-dos/"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-36048",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442034,
"published_at": "2021-01-08T00:15:11.093+00:00"
}