CVE-2026-44345 BentoML: Dockerfile command injection via docker.base_image
Attackers can execute arbitrary commands on the host by injecting Dockerfile directives via a malicious bento.yaml configuration in BentoML.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-44345?
CVE-2026-44345 is a high-severity command injection vulnerability in BentoML, published on 27 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.39, src/bentoml/_internal/container/frontend/dockerfile/templates/base_v2.j2 interpolates docker.base_image raw with no escaping, newline filtering, or validation. A malicious bento.yaml with a multi-line docker.base_image value smuggles arbitrary Dockerfile directives into the generated Dockerfile, and bentoml containerize then runs docker build which executes the injected RUN directives on the victim host. This vulnerability is fixed in 1.4.39.
Weakness: CWE-78
Which versions are affected by CVE-2026-44345?
3 open source packages ship an affected version, including bentoml. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
bentoml PyPI | All versions | 1.4.39 |
bentoml PyPI | All versions | 1.4.39 |
bentoml PyPI | All versions | 1.4.39 |
Products include Bentoml Bentoml.
How do I fix CVE-2026-44345?
Upgrade bentoml to 1.4.39 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-44345 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44345 exists.
Other vulnerabilities in BentoML
- CVE-2025-54381 BentoML is Vulnerable to an SSRF Attack Through File Upload Processing
- CVE-2025-32375 Insecure Deserialization leads to RCE in BentoML's runner server
- CVE-2025-27520 BentoML Allows Remote Code Execution (RCE) via Insecure Deserialization
- CVE-2026-44346 BentoML: Dockerfile command injection via envs[*].name in bentofile.yaml
- CVE-2026-35044 BentoML has a Server-Side Template Injection via unsandboxed Jinja2 Environment in Dockerfile generation
Sources
Also known as GHSA-78f9-r8mh-4xm2, PYSEC-2026-189.