# CVE-2018-12115: Node.js 4 and 2 others: Out-of-bounds Write

CVE-2018-12115 is fixed in 2 products on 2 platforms, first by Node.js 6 6.17.0, released February 28, 2019. 2 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-12115
- Priority: High
- CVSS: 7.5 (Medium)
- EPSS: 0.0778
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 21, 2018
- Weakness: CWE-787: Out-of-bounds Write
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2018-12115

## Description

In all versions of Node.js prior to 6.14.4, 8.11.4 and 10.9.0 when used with UCS-2 encoding (recognized by Node.js under the names `'ucs2'`, `'ucs-2'`, `'utf16le'` and `'utf-16le'`), `Buffer#write()` can be abused to write outside of the bounds of a single `Buffer`. Writes that start from the second-to-last position of a buffer cause a miscalculation of the maximum length of the input bytes to be written.

## 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 | nodejs Ubuntu 18.04.6 LTS (bionic) | 8.10.0~dfsg-2ubuntu0.4+esm1 | [nodejs 8.10.0~dfsg-2ubuntu0.4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-nodejs-8.10.0-dfsg-2ubuntu0.4-esm1.md) | Mar 28, 2019 |

## No fix yet

| Platform | Product | Status |
|---|---|---|
| Windows apps | Node.js 4 | no-fix |
| Windows apps | Node.js 8 | no-fix |

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