CVE-2026-35044
BentoML has a Server-Side Template Injection via unsandboxed Jinja2 Environment in Dockerfile generation
- State
- Published
- Severity
- 8.8 High
- Published
- Apr 6, 2026
- Updated
- Apr 6, 2026
- Reserved
- Mar 31, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | GitHub_M |
Weaknesses
- CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine
Affected Products
| Product | Versions |
|---|---|
BentoMLbentoml |
|
References
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