NetBox 4.3.5 – 4.5.4 RCE via RenderTemplateMixin_CVE-2026-29514

8.7 / 10

HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Description

NetBox versions 4.3.5 through 4.5.4 contain a remote code execution vulnerability in the RenderTemplateMixin.get_environment_params() method that allows authenticated users with exporttemplate or configtemplate permissions to execute arbitrary code by specifying malicious Python callables in the environment_params field. Attackers can bypass Jinja2 SandboxedEnvironment protections by setting the finalize parameter to any importable Python callable such as subprocess.getoutput, which is invoked on every rendered expression outside the sandbox's call interception mechanism, achieving remote code execution as the NetBox service user.

AI Analysis

Remote code execution vulnerability in NetBox via RenderTemplateMixin

Basic Information

ID CVE-2026-29514

Source VulnCheck

Published May 4, 2026 at 16:05

Affected Product

Vendor netbox-community

Product netbox

Version 4.3.5

Affected Versions netbox-community netbox 4.3.5

CWE Classification

CWE-183

AI Assessment

AI Score 8.7 / 10

AI Severity High

Vendor NetBox Community

Product NetBox

Version 4.3.5-4.5.4

References

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    "published": "2026-05-04T16:05:33.894Z",
    "modified": "2026-05-04T16:05:33.894Z",
    "type": "cve",
    "title": "NetBox 4.3.5 - 4.5.4 RCE via RenderTemplateMixin",
    "source": "VulnCheck",
    "references": "https://chocapikk.com/posts/2026/netbox-export-template-rce/\nhttps://github.com/netbox-community/netbox/issues/22079\nhttps://github.com/netbox-community/netbox/pull/22078\nhttps://www.vulncheck.com/advisories/netbox-rce-via-rendertemplatemixin",
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