# CVE-2016-10539: node-negotiator: negotiator is an HTTP content negotiator for Node.js and is used by manymodules and frameworks including Express and Koa

CVE-2016-10539 is fixed in node-negotiator on 1 platform, first by node-negotiator 0.6.1-1, released May 31, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2016-10539
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0139
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 31, 2018

## Description

negotiator is an HTTP content negotiator for Node.js and is used by manymodules and frameworks including Express and Koa. The header for"Accept-Language", when parsed by negotiator 0.6.0 and earlier isvulnerable to Regular Expression Denial of Service via a specially craftedstring.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-negotiator Ubuntu 18.04.6 LTS (bionic) | 0.6.1-1 | [node-negotiator 0.6.1-1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-node-negotiator-0.6.1-1.md) | Dec 20, 2019 |
| Linux | node-negotiator Ubuntu 20.04 LTS (focal) | 0.6.1-1 | [node-negotiator 0.6.1-1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-node-negotiator-0.6.1-1.md) | May 31, 2018 |
| Linux | node-negotiator Ubuntu 24.10 (oracular) | 0.6.1-1 | [node-negotiator 0.6.1-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-node-negotiator-0.6.1-1.md) | Jan 16, 2026 |
| Linux | node-negotiator Ubuntu 25.04 (plucky) | 0.6.1-1 | [node-negotiator 0.6.1-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-node-negotiator-0.6.1-1.md) | Jan 16, 2026 |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo