---
id: CVE-2026-15895
aliases:
  - GHSA-wcx4-wpfv-mc5c
title: 'jsii-diff: Command Injection via npm: package argument'
summary: 'jsii-diff: Command Injection via npm: package argument'
severity: high
cvss: 7.8
cwe:
  - CWE-78
vendor: jsii-diff
product: jsii-diff
ecosystem: npm
affected:
  - jsii-diff < 1.131.0
patched:
  - jsii-diff 1.131.0
published: '2026-08-07'
updated: '2026-08-07'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-wcx4-wpfv-mc5c'
references:
  - url: 'https://github.com/aws/jsii/security/advisories/GHSA-wcx4-wpfv-mc5c'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15895'
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-057-aws'
  - url: 'https://github.com/aws/jsii/releases/tag/v1.131.0'
  - url: 'https://github.com/advisories/GHSA-wcx4-wpfv-mc5c'
tags:
  - ghsa
  - npm
epss: 0.01081
epssPercentile: 0.63624
ingestedAt: '2026-08-07T19:16:20.497Z'
---

## Overview

## Summary

jsii-diff is a command line tool to compare the API differences between two jsii assemblies, and report errors if there are backwards-incompatible changes to the API. An issue exists where specially formatted command line arguments can be used to execute shell commands via this tool.

## Impact
jsii-diff supports downloading packages to compare directly from NPM, so that you can compare a proposed candidate version of your jsii package with an already-published version, by passing an argument that looks like `npm:<package-specifier>`. For example:

```
jsii-diff npm:my-package@latest .
```

By injecting a `;` into the `package-specifier` part of that command, jsii-diff can be tricked into running shell commands. For example:

```
jsii-diff "npm:lodash; touch /tmp/123" .
```

This allows anyone that can control the command-line arguments to jsii-diff to run arbitrary commands with the same permissions as the jsii-diff command itself.

## Patches
This issue has been addressed in jsii-diff version 1.131.0. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

## Workarounds
If you are unable to update, make sure only trusted actors can control the arguments passed to jsii-diff.

## References
If you have any questions or comments about this advisory, AWS asks that you contact AWS Security via the [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.

## Affected packages

- `jsii-diff < 1.131.0`

## Remediation

Upgrade to a patched release:

- `jsii-diff 1.131.0`