CVE-2026-35044Public exploitNetwork attack vector

Host code execution via unsandboxed Jinja2 rendering

Published Apr 6, 2026 · Updated Apr 6, 2026

Server-side template injection in BentoML before 1.4.38 allows remote attackers to execute host code through a malicious Bento archive. The generate_containerfile() function renders an archive-supplied dockerfile_template with an unsandboxed Jinja2 Environment and the do extension. Execution requires a user to import the archive and run bentoml containerize, where template code runs before Docker starts with the user's host privileges.

CVSS severity8.8
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in BentoML before 1.4.38 allows remote attackers to execute host code through a malicious Bento archive. The generate_containerfile() function renders an archive-supplied dockerfile_template with an unsandboxed Jinja2 Environment and the do extension. Execution requires a user to import the archive and run bentoml containerize, where template code runs before Docker starts with the user's host privileges.

The record

CVE
CVE-2026-35044
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
BentoML
Product
BentoML
Classifications
CWE-1336, T1204.002, T1059.006
Attack vector
network
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 vectornetwork
Required privilegesunauthenticated

What is affected?

BentoML · BentoMLversion=< 1.4.38

Published CVSS scores

9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
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-1336Improper Neutralization of Special Elements Used in a Template Engine
T1204.002User Execution: Malicious File
T1059.006Command and Scripting Interpreter: Python

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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