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CVE-2026-44289 high CVSS 7.5

Vulnerability in protobufjs (CVE-2026-44289)

Summary

vulnerability in protobufjs (CVE-2026-44289). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `8.0.2` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-44289** has been found in protobufjs. Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10. What to do: upgrade protobufjs to **8.0.2** or later. If unsure, ask your IT team or search "protobufjs CVE-2026-44289" on the vendor's site.
CVE-2026-44289 (protobufjs) — CWE-674 / CVSS v3 7.5 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `8.0.2` — apply immediately Workaround: Avoid decoding untrusted protobuf binary data with affected versions. 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
**A vulnerability** (CWE-674) exists in protobufjs.
📍 Affected scope
protobufjs — .
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **8.0.2**.
🛡️ Workaround
Workaround: Avoid decoding untrusted protobuf binary data with affected versions.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'protobufjs' .` 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 'protobufjs' . | 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` 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
    Avoid decoding untrusted protobuf binary data with affected versions.

    パッチが適用されるまでの応急処置として、Avoid decoding untrusted protobuf binary data with affected versions. 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 protobufjs to 8.0.2

    ステージング環境で 8.0.2 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。

  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 protobufjs
[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.0.2"}]}]

References

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