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
CVE-2026-29514 affects netbox-community's NetBox product versions 4.3.5 through 4.5.4. The vulnerability exists in the RenderTemplateMixin.get_environment_params() method, where authenticated users with specific permissions can inject malicious Python callables into the environment_params field. By setting the finalize parameter to an importable Python callable such as subprocess.getoutput, attackers can bypass the Jinja2 SandboxedEnvironment's call interception, resulting in remote code execution with the privileges of the NetBox service user. This vulnerability is classified under CWE-183 (Permissive List of Allowed Inputs). The CVSS 4.0 vector indicates network attack vector, low attack complexity, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows authenticated users with exporttemplate or configtemplate permissions to execute arbitrary code on the NetBox server as the service user. This can lead to full compromise of the affected system's confidentiality, integrity, and availability. The vulnerability is rated high severity with a CVSS score of 8.7. There are no reports of known exploits in the wild currently.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict exporttemplate and configtemplate permissions to trusted users only to reduce risk. Monitor vendor channels for updates and apply any official fixes promptly once released.
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
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-29514 affects netbox-community's NetBox product versions 4.3.5 through 4.5.4. The vulnerability exists in the RenderTemplateMixin.get_environment_params() method, where authenticated users with specific permissions can inject malicious Python callables into the environment_params field. By setting the finalize parameter to an importable Python callable such as subprocess.getoutput, attackers can bypass the Jinja2 SandboxedEnvironment's call interception, resulting in remote code execution with the privileges of the NetBox service user. This vulnerability is classified under CWE-183 (Permissive List of Allowed Inputs). The CVSS 4.0 vector indicates network attack vector, low attack complexity, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows authenticated users with exporttemplate or configtemplate permissions to execute arbitrary code on the NetBox server as the service user. This can lead to full compromise of the affected system's confidentiality, integrity, and availability. The vulnerability is rated high severity with a CVSS score of 8.7. There are no reports of known exploits in the wild currently.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict exporttemplate and configtemplate permissions to trusted users only to reduce risk. Monitor vendor channels for updates and apply any official fixes promptly once released.
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: 5/4/2026, 4:36:24 PM
Last enriched: 5/22/2026, 3:07:02 PM
Last updated: 6/19/2026, 12:55:54 AM
Views: 63
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