CVE-2026-35043Public exploit

Cloud build RCE via unquoted system packages

Published Apr 6, 2026 · Updated Apr 6, 2026

OS command injection in BentoML before 1.4.38 allows context-dependent attackers to execute commands on cloud build infrastructure. The _build_setup_script function joins docker.system_packages values from bentofile.yaml into an apt-get command without shell quoting before uploading setup.sh. Exploitation requires a victim to deploy a malicious Bento, or a user with deployment access to supply the value, and grants command execution on the build node.

CVSS severity7.8
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in BentoML before 1.4.38 allows context-dependent attackers to execute commands on cloud build infrastructure. The _build_setup_script function joins docker.system_packages values from bentofile.yaml into an apt-get command without shell quoting before uploading setup.sh. Exploitation requires a victim to deploy a malicious Bento, or a user with deployment access to supply the value, and grants command execution on the build node.

The record

CVE
CVE-2026-35043
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
BentoML
Product
BentoML
Classifications
CWE-78, T1059.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.4.38

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

BentoML · BentoMLversion=< 1.4.38

Published CVSS scores

7.8GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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