What’s Vulnerable › Vulnerabilities

CVE-2021-29060: Regular Expression Denial of Service (ReDOS)

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-21 · updated 2026-06-17
• Weakness: CWE-770

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.

Affected products

• Color-String Project Color-String: before 1.5.5 — fixed in 1.5.5
• Npm Color-String: before 1.5.5 — fixed in 1.5.5

How to fix

Upgrade to a fixed version: Color-String Project Color-String 1.5.5; Npm Color-String 1.5.5. Check the vendor advisory for mitigations.

References

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

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