High
Security advisory
Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0: Denial of Service with large HTTP headers: By using a combination of many requests with maximum sized headers (almost 80 KB per connection), and carefully timed completion of the headers, it is possible to cause the HTTP server to abort from heap allocation failure. Attack potential is mitigated by the use of a load balancer or other proxy layer.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-12121
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:15 UTC · Revision 1
Source evidence
Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0: Denial of Service with large HTTP headers: By using a combination of many requests with maximum sized headers (almost 80 KB per connection), and carefully timed completion of the headers, it is possible to cause the HTTP server to abort from heap allocation failure. Attack potential is mitigated by the use of a load balancer or other proxy layer.
osv:CVE-2018-12121
Complete source record
{
"id": "a5e544eff87c78f6a63af3adbc8674a580bb177b73cd5931d793a667e4b2ffa8",
"url": "https://osv.dev/vulnerability/CVE-2018-12121",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-12121",
"summary": "Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0: Denial of Service with large HTTP headers: By using a combination of many requests with maximum sized headers (almost 80 KB per connection), and carefully timed completion of the headers, it is possible to cause the HTTP server to abort from heap allocation failure. Attack potential is mitigated by the use of a load balancer or other proxy layer.",
"evidence": "osv:CVE-2018-12121",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-12121",
"aliases": [
"CVE-2018-12121"
],
"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/nodejs/node",
"type": "GIT",
"events": [
{
"introduced": "ce3e3c5fe15479475c068482c48eb9cbf1ac9df5"
},
{
"fixed": "b6589e3d9be963b29a8559bf7b272b54284fe1bc"
},
{
"introduced": "0d8021e5a4cf0a6aa3a700a361f6d42c2894f2ba"
},
{
"fixed": "39716a8835a0ba61683974aef70e05ce7f8e414a"
},
{
"introduced": "cf41627411886000429bde058a6594fb7f6d6d47"
},
{
"fixed": "b7103135bc7987dee97e8795b0b38293d05fd842"
},
{
"introduced": "cea049bcf8bb0f9a6e0095dbd5dffdb14dc8f71b"
},
{
"fixed": "00fb73a72eff0e90d0f85b95dbcfc3c21f89cff9"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*",
"range": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.15.0"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*",
"range": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.14.0"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*",
"range": [
{
"introduced": "10.0.0"
},
{
"fixed": "10.14.0"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "11.0.0"
},
{
"fixed": "11.3.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v6.14.4",
"v8.13.0",
"v11.2.0",
"v11.1.0",
"v10.13.0",
"v11.0.0",
"v10.12.0",
"v10.11.0",
"v8.12.0",
"v10.10.0",
"v10.9.0",
"v8.11.4",
"v10.8.0",
"v10.7.0",
"v10.6.0",
"v10.5.0",
"v10.4.1",
"v8.11.3",
"v6.14.3",
"v10.4.0",
"v10.3.0",
"v10.2.1",
"v10.2.0",
"v8.11.2",
"v10.1.0",
"v6.14.2",
"v10.0.0",
"v8.11.1",
"v6.14.1",
"v6.14.0",
"v8.11.0",
"v8.10.0",
"v6.13.1",
"v6.13.0",
"v8.9.4",
"v6.12.3",
"v8.9.3",
"v6.12.2",
"v8.9.2",
"v6.12.1",
"v8.9.1",
"v6.12.0",
"v8.9.0",
"v8.8.1",
"v6.11.5",
"v8.8.0",
"v8.7.0",
"v6.11.4",
"v8.6.0",
"v8.5.0",
"v6.11.3",
"v8.4.0",
"v8.3.0",
"v6.11.2",
"v8.2.1",
"v8.2.0",
"v8.1.4",
"v6.11.1",
"v8.1.3",
"v8.1.2",
"v8.1.1",
"v8.1.0",
"v6.11.0",
"v8.0.0",
"v6.10.3",
"v6.10.2",
"v6.10.1",
"v6.10.0",
"v6.9.5",
"v6.9.4",
"v6.9.3",
"v6.9.2",
"v6.9.1",
"v6.9.0",
"v6.8.1",
"v6.8.0",
"v6.7.0",
"v6.6.0",
"v6.5.0",
"v6.4.0",
"v6.3.1",
"v6.3.0",
"v6.2.2",
"v6.2.1",
"v6.2.0",
"v6.1.0",
"v6.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-12121.json"
}
}
],
"modified": "2026-10-24T10:30:26.238897064Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHSA-2019:1821",
"https://access.redhat.com/errata/RHSA-2019:2258",
"https://access.redhat.com/errata/RHSA-2019:3497",
"https://security.gentoo.org/glsa/202003-48",
"https://security.netapp.com/advisory/ntap-20241227-0008/",
"https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*"
],
"vendor_product": "redhat:enterprise_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_desktop",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_eus",
"extracted_events": [
{
"range": [
{
"introduced": "8.1"
},
{
"last_affected": "8.1"
},
{
"introduced": "8.2"
},
{
"last_affected": "8.2"
},
{
"introduced": "8.4"
},
{
"last_affected": "8.4"
},
{
"introduced": "8.6"
},
{
"last_affected": "8.6"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server_aus",
"extracted_events": [
{
"range": [
{
"introduced": "8.2"
},
{
"last_affected": "8.2"
},
{
"introduced": "8.4"
},
{
"last_affected": "8.4"
},
{
"introduced": "8.6"
},
{
"last_affected": "8.6"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server_tus",
"extracted_events": [
{
"range": [
{
"introduced": "8.2"
},
{
"last_affected": "8.2"
},
{
"introduced": "8.4"
},
{
"last_affected": "8.4"
},
{
"introduced": "8.6"
},
{
"last_affected": "8.6"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_workstation",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-12121",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 431578,
"published_at": "2018-11-28T17:29:00.337+00:00"
}