CVE-2026-44346: BentoML: Dockerfile command injection via envs[*].name in bentofile.yaml

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-27 · updated 2026-06-17
Weakness: CWE-78

Description

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.39, 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. This vulnerability is fixed in 1.4.39.

Affected products

BentoML: before 1.4.39 — fixed in 1.4.39

How to fix

Upgrade to a fixed version: BentoML 1.4.39. Check the vendor advisory for mitigations.

References

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