CVE-2026-44346: bentoml Command Injection

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.

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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0028

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-78 OS Command Injection

CWE-94 CWE-94

Affected Products

Vendor	Product	Versions
bentoml	bentoml	< 1.4.39

References

Advisories & Patches

https://github.com/bentoml/BentoML/security/advisories/GHSA-w2pm-x38x-jp44 https://github.com/bentoml/BentoML/security/advisories/GHSA-w2pm-x38x-jp44

Exploits

https://github.com/bentoml/BentoML/security/advisories/GHSA-w2pm-x38x-jp44 https://github.com/bentoml/BentoML/security/advisories/GHSA-w2pm-x38x-jp44

Frequently Asked Questions

What is CVE-2026-44346? +

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. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-44346? +

CVE-2026-44346 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0028, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-44346? +

CVE-2026-44346 affects products from bentoml, specifically: bentoml. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-44346? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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