# @babel/plugin-transform-modules-systemjs generates arbitrary code when compiling malicious input

Advisory record · `GHSA-fv7c-fp4j-7gwp`

- **Identifiers:** `GHSA-fv7c-fp4j-7gwp` · `CVE-2026-44728`
- **State:** Confirmed
- **Severity:** CVSS 8.2 High
- **Critical:** No
- **Weakness (CWE):** [CWE-94](https://cwe.mitre.org/data/definitions/94.html) · [CWE-843](https://cwe.mitre.org/data/definitions/843.html)
- **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md) · [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md)
- **Published:** 8 May 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 8 May 2026, 20:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `@babel/plugin-transform-modules-systemjs` (npm): affected `>=7.12.0, <7.29.4 || >=8.0.0-alpha.0, <8.0.0-alpha.13`; fixed in `7.29.4`, `8.0.0-alpha.13`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.2 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0013, the 2nd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 5 May 2026, 16:12 UTC: [Published by the maintainers as a GitHub repository advisory](https://github.com/babel/babel/security/advisories/GHSA-fv7c-fp4j-7gwp)

## Sources

- [GitHub Advisory Database: GHSA-fv7c-fp4j-7gwp](https://github.com/advisories/GHSA-fv7c-fp4j-7gwp)
- [OSV: GHSA-fv7c-fp4j-7gwp](https://osv.dev/vulnerability/GHSA-fv7c-fp4j-7gwp)
- <https://github.com/babel/babel/security/advisories/GHSA-fv7c-fp4j-7gwp>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-44728>
- <https://github.com/babel/babel>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-fv7c-fp4j-7gwp>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-fv7c-fp4j-7gwp/>. Everything for agents: <https://agentprime.io/llms.txt>.