# CVE-2026-44345: BentoML command injection in Dockerfile base_image template

Source: https://junglewise.ai/threats/cve-2026-44345-bentoml-command-injection-in-dockerfile-base-image-template  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-27. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2026-44345 · Severity: high · CVSS 8.8 · Published 2026-05-27

BentoML is a platform used to package and deploy machine learning models. A security vulnerability allows an attacker to hide malicious commands inside a model configuration file. If a user tries to build a container image from a compromised model, these hidden commands will execute on their computer, potentially allowing the attacker to steal data or take control of the system.

Technologies: [bentoml (PyPI)](https://junglewise.ai/threats/technologies/bentoml). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-44345 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-44345 being exploited in the wild.

**How severe is CVE-2026-44345?** High severity, with a CVSS score of 8.8, published 27 May 2026.

**Which products and versions are affected?** bentoml (PyPI) <= 1.4.38, ECOSYSTEM:introduced=0,fixed=1.4.39.

**Is there a fix for CVE-2026-44345?** Yes. bentoml (PyPI): upgrade to 1.4.39 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-44345 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-44345?** Check whether you run bentoml (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- bentoml (PyPI): upgrade to 1.4.39 or later

  ```sh
  pip install "bentoml>=1.4.39"
  ```


## Technical details

A command injection vulnerability exists in BentoML's Dockerfile generation logic. The Jinja2 template `base_v2.j2` interpolates the `docker.base_image` value from `bento.yaml` without validation or newline filtering. By providing a multi-line string containing `RUN` directives, an attacker can achieve arbitrary code execution on the host running `bentoml containerize` when it invokes `docker build`. This is a member of a class of injection bugs affecting several fields in the build configuration. The issue is fixed in version 1.4.39 by implementing stricter validation on configuration fields.

## Affected products

- BentoML BentoML <= 1.4.38

## Identifiers

- CVE-2026-44345
- GHSA-78f9-r8mh-4xm2
- PYSEC-2026-189

## Timeline

- 2026-05-07: disclosed: Advisory published by maintainers
- 2026-05-11: advisory: GHSA published
- 2026-05-27: advisory: NVD published CVE-2026-44345
- 2026-04-28: other: Vulnerability identified in main branch code

## References

- [https://api.github.com/users/SSJCorpSec](https://api.github.com/users/SSJCorpSec)
- [https://github.com/SSJCorpSec](https://github.com/SSJCorpSec)
- [https://api.github.com/users/SSJCorpSec/gists%7B/gist_id%7D](https://api.github.com/users/SSJCorpSec/gists%7B/gist_id%7D)
- [https://api.github.com/users/SSJCorpSec/repos](https://api.github.com/users/SSJCorpSec/repos)
- [https://avatars.githubusercontent.com/u/220600175?v=4](https://avatars.githubusercontent.com/u/220600175?v=4)
- [https://api.github.com/users/SSJCorpSec/events%7B/privacy%7D](https://api.github.com/users/SSJCorpSec/events%7B/privacy%7D)

## Related threats

- [bentoml OpenLLM command injection in Model Repository Directory Name Handler](https://junglewise.ai/threats/cve-2026-15035-bentoml-openllm-command-injection-in-model-repository-directory)
- [PYSEC-2026-1218 - BentoML has a Path Traversal via Bentofile Configuration](https://junglewise.ai/threats/cve-2026-24123-bentoml-has-a-path-traversal-via-bentofile-configuration)
- [PYSEC-2026-1219 - BentoML Denial of Service (DoS) via Multipart Boundary](https://junglewise.ai/threats/cve-2024-9056-bentoml-denial-of-service-dos-via-multipart-boundary)
- [BentoML command injection in Dockerfile generation via bentofile.yaml](https://junglewise.ai/threats/cve-2026-44346-bentoml-command-injection-in-dockerfile-generation-via-bentofile)
- [BentoML information disclosure via symlink traversal in build context](https://junglewise.ai/threats/cve-2026-40610-bentoml-information-disclosure-via-symlink-traversal-in-build)