High
Socket.IO: Zero-attachment Memory Exhaustion
Type: advisorySources: OSV
Socket.IO enables bidirectional and low-latency communication for every platform. Prior to 4.2.7, 3.4.5, and 3.3.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This vulnerability is fixed in 4.2.7, 3.4.5, and 3.3.6.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-69185
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 20:21 UTC · Revision 1
Source evidence
Socket.IO: Zero-attachment Memory Exhaustion
core-osv · Original sourcePublished 3 Aug 2026, 19:09 UTC
Socket.IO enables bidirectional and low-latency communication for every platform. Prior to 4.2.7, 3.4.5, and 3.3.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This vulnerability is fixed in 4.2.7, 3.4.5, and 3.3.6.
osv:CVE-2026-69185
Complete source record
{
"id": "340cba36c5dea9db2f42de1ba4749a0401b59dcd32b4ab844244ace49114e037",
"url": "https://osv.dev/vulnerability/CVE-2026-69185",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Socket.IO: Zero-attachment Memory Exhaustion",
"summary": "Socket.IO enables bidirectional and low-latency communication for every platform. Prior to 4.2.7, 3.4.5, and 3.3.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This vulnerability is fixed in 4.2.7, 3.4.5, and 3.3.6.",
"evidence": "osv:CVE-2026-69185",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-69185",
"aliases": [
"CVE-2026-69185",
"GHSA-2m8v-j782-fhvr"
],
"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/socket.io",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "98e61b941fb9915614e0b962588817efb795020c"
},
{
"fixed": "e590976beb69f98faa44da7653f4ab55c5e0e61a"
},
{
"introduced": "5eaeffc8e2244b73dd13fd2562c9684ad289997b"
},
{
"fixed": "4054894738817f5a2125e6e6b18e79d92c75ab33"
},
{
"fixed": "7c6ef571a00656718e9e05e3b948fd1758b2a7b4"
},
{
"fixed": "9c6323e5cde41bd75df3379b5fc9293664a5f240"
},
{
"fixed": "ced94ffa3ac020a8f3c14eb98a3bf34acb14d291"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.3.6"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "3.4.0"
},
{
"fixed": "3.4.5"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "4.0.0"
},
{
"fixed": "4.2.7"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "7c6ef571a00656718e9e05e3b948fd1758b2a7b4"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "9c6323e5cde41bd75df3379b5fc9293664a5f240"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "ced94ffa3ac020a8f3c14eb98a3bf34acb14d291"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"socket.io-parser@3.3.5",
"socket.io-parser@3.4.4",
"socket.io-adapter@2.5.8",
"engine.io-client@6.6.6",
"engine.io@6.6.9",
"socket.io-adapter@2.5.7",
"engine.io-client@6.6.5",
"engine.io@6.6.8",
"engine.io@6.6.7",
"engine.io@6.6.6",
"socket.io@4.8.3",
"socket.io-client@4.8.3",
"socket.io-parser@4.2.5",
"socket.io-adapter@2.5.6",
"engine.io-client@6.6.4",
"socket.io@4.8.2",
"socket.io-client@4.8.2",
"engine.io@6.6.5",
"@socket.io/redis-streams-emitter@0.1.1",
"@socket.io/redis-streams-emitter@0.1.0",
"@socket.io/cluster-adapter@0.3.0",
"@socket.io/postgres-emitter@0.1.1",
"engine.io@6.6.4",
"engine.io@6.6.3",
"engine.io-client@6.6.3",
"socket.io@4.8.1",
"socket.io-client@4.8.1",
"engine.io-client@6.6.2",
"engine.io@6.6.2",
"socket.io@4.8.0",
"socket.io-client@4.8.0",
"engine.io@6.6.1",
"engine.io-client@6.6.1",
"@socket.io/cluster-engine@0.1.0",
"engine.io-parser@5.2.3",
"socket.io@4.7.5",
"4.7.5",
"4.7.4",
"4.7.3",
"4.7.2",
"4.7.1",
"4.7.0",
"4.6.2",
"4.6.1",
"4.6.0",
"4.6.0-alpha1",
"4.5.4",
"4.5.3",
"4.5.2",
"4.5.1",
"4.5.0",
"4.4.1",
"4.4.0",
"4.3.2",
"4.3.1",
"4.3.0",
"4.2.0",
"4.1.3",
"4.1.2",
"4.1.1",
"4.1.0",
"4.0.2",
"4.0.1",
"4.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-69185.json"
}
}
],
"modified": "2026-10-28T02:30:23.354312079Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69185.json",
"https://github.com/socketio/socket.io/security/advisories/GHSA-2m8v-j782-fhvr",
"https://nvd.nist.gov/vuln/detail/CVE-2026-69185",
"https://github.com/socketio/socket.io/commit/7c6ef571a00656718e9e05e3b948fd1758b2a7b4",
"https://github.com/socketio/socket.io/commit/9c6323e5cde41bd75df3379b5fc9293664a5f240",
"https://github.com/socketio/socket.io/commit/ced94ffa3ac020a8f3c14eb98a3bf34acb14d291"
],
"provider_metadata": {
"cwe_ids": [
"CWE-20",
"CWE-754"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69185.json"
}
},
"related_cves": [
{
"value": "CVE-2026-69185",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 489783,
"published_at": "2026-08-03T19:09:10.073+00:00"
}