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TI-2026-27247 Aliases CVE-2026-35044GHSA-v959-cwq9-7hr6

BentoML has a Server-Side Template Injection via unsandboxed Jinja2 Environment in Dockerfile generation

Priority HIGH 76CWE-1336Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-1336.

Summary

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.38, the Dockerfile generation function generate_containerfile() in src/bentoml/_internal/container/generate.py uses an unsandboxed jinja2.Environment with the jinja2.ext.do extension to render user-provided dockerfile_template files. When a victim imports a malicious bento archive and runs bentoml containerize, attacker-controlled Jinja2 template code executes arbitrary Python directly on the host machine, bypassing all container isolation. This vulnerability is fixed in 1.4.38.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00398 34th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed BentoML (bentoml): 1.4.38bentoml (PyPI): 1.4.38

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
bentomlBentoMLbefore 1.4.381.4.38Patch availableCNA
—bentoml (PyPI)before 1.4.381.4.38Patch availableGHSA-v959-cwq9-7hr6
  • BentoML Vendorbentoml Affected before 1.4.38 Fixed in 1.4.38 Patch available CNA
  • bentoml (PyPI) Vendor— Affected before 1.4.38 Fixed in 1.4.38 Patch available GHSA-v959-cwq9-7hr6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:bentoml:bentoml:*:*:*:*:*:*:*:*before 1.4.38Vulnerablebentoml
  • cpe:2.3:a:bentoml:bentoml:*:*:*:*:*:*:*:* Versions before 1.4.38 Vulnerable ·bentoml

Remediation

  • Fix · CNA BentoML (bentoml) Fixed in 1.4.38
  • Fix · GHSA-v959-cwq9-7hr6 bentoml (PyPI) Fixed in 1.4.38 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-35044
  2. 2026-10-03 Alias added: GHSA-v959-cwq9-7hr6

References

Exploit 1

Advisory 1

Other 2

  • TI-2025-34190 BentoML is Vulnerable to an SSRF Attack Through File Upload Processing CVSS 3.1CRITICAL 9.9
  • TI-2025-23454 Insecure Deserialization leads to RCE in BentoML's runner server CVSS 3.1CRITICAL 9.8
  • TI-2025-20352 BentoML Allows Remote Code Execution (RCE) via Insecure Deserialization CVSS 3.1CRITICAL 9.8
  • TI-2026-32312 BentoML: Dockerfile command injection via envs[*].name in bentofile.yaml CVSS 3.1HIGH 8.8
  • TI-2026-32311 BentoML: Dockerfile command injection via docker.base_image CVSS 3.1HIGH 8.8
  • TI-2026-22249 BentoML has an Arbitrary File Write via Symlink Path Traversal in Tar Extraction CVSS 4.0HIGH 8.6
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences