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CVE-2026-15895 high CVSS 7.8

OS Command Injection in Amazon jsii-diff (CVE-2026-15895)

Summary

OS command injection in Amazon jsii-diff (CVE-2026-15895). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1.131.0 or later.

Original description

The description as published by the source.

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:. 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 or directly via email to [aw…

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-15895 has been found in Amazon jsii-diff.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: upgrade Amazon jsii-diff to 1.131.0 or later.
If unsure, ask your IT team or search "Amazon jsii-diff CVE-2026-15895" on the vendor's site.

CVE-2026-15895 (Amazon jsii-diff) — CWE-78 / CVSS v3 7.8
Attack vector: local / unauthenticated
Patched: 1.131.0 — apply immediately
Workaround: If you are unable to update, make sure only trusted actors can control the arguments passed to jsii-diff.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

OS command injection (CWE-78) exists in Amazon jsii-diff.

📍 Affected scope

Check the vendor advisory for the affected versions of Amazon jsii-diff.

🔥 Severity

Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.131.0.

🛡️ Workaround

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

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'jsii-diff' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'jsii-diff' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で jsii-diff を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply temporary workaround mitigate 
    If you are unable to update, make sure only trusted actors can control the arguments passed to jsii-diff.

    パッチが適用されるまでの応急処置として、If you are unable to update, make sure only trusted actors can control the arguments passed to jsii-diff. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 3
    Apply patch patch 
    Upgrade Amazon jsii-diff to 1.131.0

    ステージング環境で 1.131.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  4. 4
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

npm jsii-diff
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.131.0"}]}]

References

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