Microcosm cc Bluemonday by microcosm-cc
bluemonday: a fast golang HTML sanitizer (inspired by the OWASP Java HTML Sanitizer) to scrub user generated content of XSS
About Microcosm cc Bluemonday
From the project's README at github.com/microcosm-cc/bluemonday. Lightly cleaned for readability; for the full source see the upstream repo.
bluemonday is a HTML sanitizer implemented in Go. It is fast and highly configurable.
bluemonday takes untrusted user generated content as an input, and will return HTML that has been sanitised against an allowlist of approved HTML elements and attributes so that you can safely include the content in your web page.
If you accept user generated content, and your server uses Go, you need bluemonday.
The default policy for user generated content () turns this:
Health score breakdown
6-dimension composite. See methodology for formula and weights.
Adoption signals
Real-world usage data, pulled from each registry. The bigger the numbers, the more battle-tested the project.
| Signal | Value | Source |
|---|---|---|
| GitHub stars | 3.7k | github.com/microcosm-cc/bluemonday |
| GitHub forks | 193 | github.com/microcosm-cc/bluemonday |
Release & maintenance
Is this project actively maintained, or about to die? Check the recency of last commit and last release.
| Project age | 12.5 years | since Nov 2013 |
| Last commit | 1.1 years ago | Apr 4, 2025 |
| Releases shipped | 26 | last: 2.6 years ago |
| Security policy | SECURITY.md | declared by maintainers |
Self-hosting cost across providers
Detected requirements: 4GB RAM, 40GB disk minimum. Cheapest plan per provider that meets the requirement.
| Provider | Plan | Specs | Monthly | |
|---|---|---|---|---|
| hetzner | CAX11 | 2c · 4GB · 40GB | $4.13 USD | Deploy → |
| vultr | VC2 | 1c · 1GB · 25GB | $5 USD | Deploy → |
| linode | Nanode 1GB | 1c · 1GB · 25GB | $5.12 USD | Deploy → |
| digitalocean | Basic Regular 1GB | 1c · 1GB · 25GB | $6 USD | Deploy → |
Security advisories
CVE-2021-42576. Ready to self-host Microcosm cc Bluemonday?
Spin up a hetzner CAX11 (4GB RAM, 40GB disk) for $4.13/mo and follow the project's official install docs.
Data last refreshed May 7, 2026.
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