CVE-2026-29514: Permissive List of Allowed Inputs in netbox-community netbox
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
Technical Summary
The vulnerability in netbox-community netbox affects versions 4.3.5 through 4.5.4. It arises from a permissive list of allowed inputs in the RenderTemplateMixin.get_environment_params() method. Authenticated users with specific permissions can specify malicious Python callables, such as subprocess.getoutput, in the environment_params field. This bypasses the Jinja2 SandboxedEnvironment's call interception by setting the finalize parameter to an importable Python callable, leading to remote code execution under the NetBox service user context.
Potential Impact
Successful exploitation allows an authenticated user with exporttemplate or configtemplate permissions to execute arbitrary code on the NetBox server. This can lead to full compromise of the NetBox service user privileges, potentially affecting the confidentiality, integrity, and availability of the system and its data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict exporttemplate and configtemplate permissions to trusted users only and monitor for suspicious activity related to template rendering.
CVE-2026-29514: Permissive List of Allowed Inputs in netbox-community netbox
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.
CVSS v4.0
Score 8.7high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in netbox-community netbox affects versions 4.3.5 through 4.5.4. It arises from a permissive list of allowed inputs in the RenderTemplateMixin.get_environment_params() method. Authenticated users with specific permissions can specify malicious Python callables, such as subprocess.getoutput, in the environment_params field. This bypasses the Jinja2 SandboxedEnvironment's call interception by setting the finalize parameter to an importable Python callable, leading to remote code execution under the NetBox service user context.
Potential Impact
Successful exploitation allows an authenticated user with exporttemplate or configtemplate permissions to execute arbitrary code on the NetBox server. This can lead to full compromise of the NetBox service user privileges, potentially affecting the confidentiality, integrity, and availability of the system and its data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict exporttemplate and configtemplate permissions to trusted users only and monitor for suspicious activity related to template rendering.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-03-04T15:39:26.872Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f8cb08cbff5d86103668a6
Added to database: 05/04/2026, 16:36:24 UTC
Last enriched: 07/15/2026, 10:50:30 UTC
Last updated: 08/01/2026, 19:17:59 UTC
Views: 93
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