# CVE-2018-12121: Node.js 6 and 1 other: Uncontrolled Resource Consumption / Denial of Service

CVE-2018-12121 is fixed in 2 products on 2 platforms, first by Node.js 6 6.17.0, released February 28, 2019. 1 other affected product has no fix yet. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-12121
- Priority: High
- CVSS: 7.5 (Moderate)
- EPSS: 0.1021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 28, 2018
- Weakness: CWE-400: Uncontrolled Resource Consumption / Denial of Service
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2018-12121

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Node.js 6 | 6.17.0 | [Node.js 6 6.17.0](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.6-6.17.0.md) | Feb 28, 2019 |
| Linux | http-parser RHEL 8 | 0:2.8.0-5.el8 | [RHSA-2019:3497](https://patchblox.com/security/data/fix/linux/rhsa-2019-3497.md) | Nov 5, 2019 |
| Linux | http-parser ol 8 | 0:2.8.0-5.el8 | [ELSA-2019-3497](https://patchblox.com/security/data/fix/linux/elsa-2019-3497.md) | Nov 14, 2019 |

## No fix yet

| Platform | Product | Status |
|---|---|---|
| Windows apps | Node.js 8 | no-fix |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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