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CVE-2026-42290
high
CVSS 7.8
OS Command Injection in protobufjs-cli (CVE-2026-42290)
Summary
OS command injection in protobufjs-cli (CVE-2026-42290). Successful exploitation can lead to full system takeover. Exploitable via ``pbts``. Mitigation: upgrade to `2.0.2` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-42290** has been found in protobufjs-cli.
Attackers can target a specific entry point like ``pbts`` over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: upgrade protobufjs-cli to **2.0.2** or later.
If unsure, ask your IT team or search "protobufjs-cli CVE-2026-42290" on the vendor's site.
CVE-2026-42290 (protobufjs-cli) — CWE-78 / CVSS v3 7.8
Attack vector: local / unauthenticated
Attack surface: `pbts` / `child_process.exec`
Patched: `2.0.2` — apply immediately
Workaround: Do not run affected versions of `pbts` on attacker-controlled file names or paths.
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 protobufjs-cli. Attackers reach the vulnerable code path via ``pbts`` without authentication.
📍 Affected scope
protobufjs-cli — . Attack surface: `pbts` / `child_process.exec`.
🔥 Severity
Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **2.0.2**.
🛡️ Workaround
Workaround: Do not run affected versions of `pbts` on attacker-controlled file names or paths.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'protobufjs-cli' .` 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
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1Identify exposure identify
grep -r 'protobufjs-cli' . | 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 `protobufjs-cli` を grep し、稼働しているサービス・バージョンを把握する。
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5Apply temporary workaround mitigate
Do not run affected versions of `pbts` on attacker-controlled file names or paths.パッチが適用されるまでの応急処置として、Do not run affected versions of `pbts` on attacker-controlled file names or paths. を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade protobufjs-cli to 2.0.2ステージング環境で 2.0.2 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。
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7Post-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
protobufjs-cli
[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.0.2"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-42290
- package https://github.com/protobufjs/protobuf.js
- web https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-f84p-cvgm-xgjj
- web https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-cli-v1.2.1
- web https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-cli-v2.0.2
- web https://github.com/advisories/GHSA-f84p-cvgm-xgjj