CVE-2026-35043 BentoML: command injection in cloud deployment setup script (deployment.py)
Attackers can execute arbitrary commands on cloud build infrastructure via unquoted system packages in BentoML deployment scripts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-35043?
CVE-2026-35043 is a high-severity command injection vulnerability in BentoML, published on 6 Apr 2026. It can only be exploited from the same machine or local network, 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 1.4.38, the cloud deployment path in src/bentoml/_internal/cloud/deployment.py was not included in the fix for CVE-2026-33744. Line 1648 interpolates system_packages directly into a shell command using an f-string without any quoting. The generated script is uploaded to BentoCloud as setup.sh and executed on the cloud build infrastructure during deployment, making this a remote code execution on the CI/CD tier. This vulnerability is fixed in 1.4.38.
Weakness: CWE-78
Which versions are affected by CVE-2026-35043?
3 open source packages ship an affected version, including bentoml. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
bentoml PyPI | All versions | 1.4.38 |
bentoml PyPI | All versions | 1.4.38 |
bentoml PyPI | All versions | 1.4.38 |
Products include Bentoml Bentoml.
How do I fix CVE-2026-35043?
Upgrade bentoml to 1.4.38 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-35043 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35043 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-2026-44345 BentoML: Dockerfile command injection via docker.base_image
- CVE-2026-44346 BentoML: Dockerfile command injection via envs[*].name in bentofile.yaml
Sources
Also known as GHSA-fgv4-6jr3-jgfw, PYSEC-2026-158.