# CVE-2021-33587: node-css-what: The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexit...

CVE-2021-33587 is fixed in node-css-what on 1 platform, first by node-css-what 2.1.0-1+deb10u1build0.18.04.1, released September 29, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-33587
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0204
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 28, 2021

## Description

The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-css-what Ubuntu 18.04.6 LTS (bionic) | 2.1.0-1+deb10u1build0.18.04.1 | [node-css-what 2.1.0-1+deb10u1build0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-node-css-what-2.1.0-1-deb10u1build0.18.04.1.md) | Sep 29, 2022 |
| Linux | node-css-what Ubuntu 20.04 LTS (focal) | 3.2.1-1ubuntu0.1~esm1 | [node-css-what 3.2.1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-node-css-what-3.2.1-1ubuntu0.1-esm1.md) | Sep 29, 2022 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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