CVE-2026-44346Public exploitNetwork attack vector

Host command execution via newline-injected environment names

Published May 27, 2026 · Updated May 27, 2026

Command injection in BentoML before 1.4.39 allows remote attackers to execute commands on a build host through a malicious bento archive. The base_v2.j2 Dockerfile template interpolates envs[*].name without escaping or newline validation, turning injected lines into RUN directives. Execution requires a user to import the crafted archive and run bentoml containerize, after which Docker executes the directives in the build environment.

CVSS severity8.8
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

Command injection in BentoML before 1.4.39 allows remote attackers to execute commands on a build host through a malicious bento archive. The base_v2.j2 Dockerfile template interpolates envs[*].name without escaping or newline validation, turning injected lines into RUN directives. Execution requires a user to import the crafted archive and run bentoml containerize, after which Docker executes the directives in the build environment.

The record

CVE
CVE-2026-44346
Published
May 27, 2026
Updated
May 27, 2026
Vendor
BentoML
Product
BentoML
Classifications
CWE-78, CWE-94, T1204.002, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 1.4.39

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BentoML · BentoMLversion=< 1.4.39

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1204.002Malicious File
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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