CVE-2026-35044 — BentoML has a Server-Side Template Injection via unsandboxed Jinja2 Environment in Dockerfile generation

Description (CNA)

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 (CNA)

Vendor / product	Versions
bentoml / BentoML	affected < 1.4.38

CWE

CWE-1336

References

https://github.com/bentoml/BentoML/security/advisories/GHSA-v959-cwq9-7hr6

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.