CVE-2026-29514Public exploitNetwork attack vector

Authenticated code execution via unrestricted finalize callable

Published May 4, 2026 · Updated May 4, 2026

Code injection in NetBox 4.3.5 through 4.5.4 allows remote authenticated users with template permissions to execute arbitrary code. RenderTemplateMixin.get_environment_params() resolves any string-valued finalize parameter with import_string() and passes the callable to Jinja2 outside sandbox call interception. ExportTemplate or ConfigTemplate permissions are required, and successful rendering runs the callable as the NetBox service user.

CVSS severity8.7
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in NetBox 4.3.5 through 4.5.4 allows remote authenticated users with template permissions to execute arbitrary code. RenderTemplateMixin.get_environment_params() resolves any string-valued finalize parameter with import_string() and passes the callable to Jinja2 outside sandbox call interception. ExportTemplate or ConfigTemplate permissions are required, and successful rendering runs the callable as the NetBox service user.

The record

CVE
CVE-2026-29514
Published
May 4, 2026
Updated
May 4, 2026
Vendor
NetBox Labs
Product
NetBox
Classifications
CWE-183, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 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=4.3.5 <=4.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

NetBox Labs · NetBoxversion=4.3.5 <=4.5.4

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-183Permissive List of Allowed Inputs
T1059.006Python

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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