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CVE-2026-35043

OS Command Injection in bentoml (CVE-2026-35043)

Summary

OS command injection in bentoml (CVE-2026-35043). Successful exploitation can lead to full system takeover. Exploitable via ``system_packages``. Mitigation: upgrade to `1.4.38` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-35043** has been found in bentoml. Attackers can target a specific entry point like ``system_packages`` over the network to misuse the product. Successful exploitation can lead to full system takeover. CVSS score: ?/10. What to do: upgrade bentoml to **1.4.38** or later. If unsure, ask your IT team or search "bentoml CVE-2026-35043" on the vendor's site.
CVE-2026-35043 (bentoml) — CWE-78 / Attack vector: local / unauthenticated Attack surface: `system_packages` / `images.py` / `shlex.quote` / `setup.sh` Patched: `1.4.38` — apply immediately 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 bentoml. Attackers reach the vulnerable code path via ``system_packages`` without authentication.
📍 Affected scope
bentoml — . Attack surface: `system_packages` / `images.py` / `shlex.quote` / `setup.sh`.
🔥 Severity
Severity: ?. Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **1.4.38**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'bentoml' .` 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 'bentoml' . | 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 `bentoml` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade bentoml to 1.4.38

    ステージング環境で 1.4.38 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。

  3. 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

PyPI bentoml
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.38"}]}]
pip bentoml
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.38"}]}]

References

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