h3

npm

Is h3 safe to use?

Based on the latest brin safety scan, no vulnerabilities or threats were detected for h3 v2.0.1-rc.11. Trust score: 65/100. 1 known CVE, no detected threat patterns, and no suspicious capabilities identified. This is an automated, point-in-time assessment.

Install (safety-checked)

h3 Passed Security Checks

No security concerns detected

clean
CVEs

1

Threats

0

Install Scripts

0

h3 CVE Vulnerabilities (1)

h3 v1 has Request Smuggling (TE.TE) issue

Fixed in: 1.15.5

brin Recommendations

  • Update to a patched version to address 1 high-severity CVE.

Install with brin add h3 to automatically apply these checks before installation.

This is an automated, point-in-time assessment and may contain errors. Findings are risk indicators, not confirmed threats. Security posture may change over time. Maintainers can dispute findings via the brin review process.

h3 Capabilities & Permissions

What h3 can access when installed. Review these capabilities before using with AI agents like Cursor, Claude Code, or Codex.

Network Access

This package makes network requests.

datatracker.ietf.orgdeveloper.mozilla.orgexample.comfetch.spec.whatwg.orggithub.comh3.devtools.ietf.orgwww.rfc-editor.org
Protocols: http, https

AGENTS.md for h3

Good instructions lead to good results. brin adds h3 documentation to your AGENTS.md so your agent knows how to use it properly—improving both safety and performance.

brin init

Vercel's research: 100% accuracy with AGENTS.md vs 53% without →

h3 Documentation & Source Code

For the full h3 README, API documentation, and source code, visit the official package registry.

Frequently asked questions about h3 safety

Weekly Downloads

4.1M

Version

2.0.1-rc.11

License

MIT

Last Scanned

Feb 1, 2026

Trust Score

65/100·Legitimacy signals, not safety

CVEs (1)

CVE-2026-23527

h3 v1 has Request Smuggling (TE.TE) issue

Fixed in: 1.15.5

Capabilities

Network

Connects to: datatracker.ietf.org, developer.mozilla.org, example.com...

Is h3 Safe? | npm Safety Scan - brin