What’s Vulnerable › Vulnerabilities
CVE-2026-35044: BentoML has a Server-Side Template Injection via unsandboxed Jinja2 Environment in Dockerfile generation
- Severity: critical (CVSS 9.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-04-06 · updated 2026-10-23
- Weakness: CWE-1336
Description
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.
Affected products
- BentoML: before 1.4.38 — fixed in 1.4.38
How to fix
Upgrade to a fixed version: BentoML 1.4.38. Check the vendor advisory for mitigations.
References
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