# Insecure random number generation in keypair

Advisory record · `GHSA-3f99-hvg4-qjwj`

- **Identifiers:** `GHSA-3f99-hvg4-qjwj` · `CVE-2021-41117`
- **State:** Confirmed
- **Severity:** CVSS 8.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-335](https://cwe.mitre.org/data/definitions/335.html)
- **Tags:** [CWE-335](https://agentprime.io/advisories/tag/cwe-335.md)
- **Published:** 11 Oct 2021
- **Updated:** 8 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 Oct 2021, 17:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `keypair` (npm): affected `<1.0.4`; fixed in `1.0.4`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.7 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.032, the 88th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 11 Oct 2021. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-3f99-hvg4-qjwj](https://github.com/advisories/GHSA-3f99-hvg4-qjwj)
- [OSV: GHSA-3f99-hvg4-qjwj](https://osv.dev/vulnerability/GHSA-3f99-hvg4-qjwj)
- <https://github.com/juliangruber/keypair/security/advisories/GHSA-3f99-hvg4-qjwj>
- <https://nvd.nist.gov/vuln/detail/CVE-2021-41117>
- <https://github.com/juliangruber/keypair/commit/9596418d3363d3e757676c0b6a8f2d35a9d1cb18>
- <https://github.com/juliangruber/keypair>
- <https://github.com/juliangruber/keypair/releases/tag/v1.0.4>
- <https://securitylab.github.com/advisories/GHSL-2021-1012-keypair>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-3f99-hvg4-qjwj>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-3f99-hvg4-qjwj/>. Everything for agents: <https://agentprime.io/llms.txt>.