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CVE-2026-44346 high CVSS 8.8

OS Command Injection in bentoml (CVE-2026-44346)

Summary

OS command injection in bentoml (CVE-2026-44346). Successful exploitation can lead to full system takeover. Exploitable via bentofile.yaml. Mitigation: upgrade to 1.4.39 or later.

Original description

The description as published by the source.

BentoML envs[*].name Dockerfile command injection — sibling of CVE-2026-33744 / CVE-2026-35043

A malicious bentofile.yaml containing a newline-injected value in envs[*].name produces unquoted RUN directives in the BentoML-generated Dockerfile. When the victim runs bentoml containerize on the imported bento, those RUN directives execute on the host during docker build. Verified end-to-end on bentoml==1.4.38.

Vulnerable code

src/bentoml/_internal/container/frontend/dockerfile/templates/base_v2.j2:71-73:

{% for env in __bento_envs__ %}
{% set stage = env.stage | default("all") -%}
{% if stage != "runtime" -%}
ARG {{ env.name }}{% if env.value %}={{ env.value | bash_quote }}{% endif %}
ENV {{ env.name }}=${{ env.name }}
{% endif -%}
{% endfor %}

env.value is bash-quoted via the bash_quote filter, but env.name is interpolated raw with no escaping or newline filtering. The template is rendered by _bentoml_impl/docker.generate_dockerfile (the v2 SDK Docker generation path used by bentoml containerize for modern services).

Sibling relationship to existing CVEs

The earlier patches addressed the same Dockerfile-command-injection class for a different bentofile field:

  • CVE-2026-33744 / GHSA-jfjg-vc52-wqvf (2026-03-25): added bash_quote to system_packages interpolation in Dockerfile templates and images.py.
  • CVE-2026-35043 / GHSA-fgv4-6jr3-jgfw (2026-04-02): added shlex.quote to system_packages in the cloud…

Source: GitHub Security Advisories (Global) 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-2026-44346 has been found in bentoml.
Attackers can target a specific entry point like bentofile.yaml over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade bentoml to 1.4.39 or later.
If unsure, ask your IT team or search "bentoml CVE-2026-44346" on the vendor's site.

CVE-2026-44346 (bentoml) — CWE-78 / CVSS v3 8.8
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: bentofile.yaml / RUN / env.value / bash_quote
Patched: 1.4.39 — 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 bentofile.yaml without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of bentoml. Attack surface: bentofile.yaml / RUN / env.value / bash_quote.

🔥 Severity

Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.4.39.

🛡️ 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

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. 2
    Apply patch patch 
    Upgrade bentoml to 1.4.39

    ステージング環境で 1.4.39 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。

  3. 3
    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

pip bentoml
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.39"}]}]
PyPI bentoml
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.39"}]}]

References

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