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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.

AI summary snake-internal / snake-material-v2

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
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 (7 steps)

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. 5
    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. 6
    Apply patch patch
    Upgrade 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と、Step 3 で見つけた異常検知の続報チェックを含めること。

  4. 7
    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 Step 3 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

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

References

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