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CVE-2026-29514

8.8 · HIGH

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 c…

Published May 4, 2026CWE-183EPSS 1.10%

Overview

CVE-2026-29514 is a high-severity vulnerability. It was published on May 4, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refchocapikk.com/posts/2026/netbox-export-template-rce/GitHubgithub.com/netbox-community/netbox/commit/d124c5fe86e12aad61285133c0caf16adcda8f2eGitHubgithub.com/netbox-community/netbox/issues/22079GitHubgithub.com/netbox-community/netbox/pull/22078GitHubgithub.com/netbox-community/netbox/pull/22170GitHubgithub.com/netbox-community/netbox/releases/tag/v4.6.1Refwww.vulncheck.com/advisories/netbox-rce-via-rendertemplatemixin

How CyberStrike helps

Frequently asked questions

What is CVE-2026-29514?

CVE-2026-29514 is a high-severity vulnerability. It was published on May 4, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-29514?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-29514?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-29514?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-29514 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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