CVE-2026-29514

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.

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No vendor mitigations ingested yet for this CVE. The mitigation-content worker queues fetches as references arrive — check back in a few minutes, or see the references list below.

References

• https://chocapikk.com/posts/2026/netbox-export-template-rce/
• https://github.com/netbox-community/netbox/commit/d124c5fe86e12aad61285133c0caf16adcda8f2e
• https://github.com/netbox-community/netbox/issues/22079
• https://github.com/netbox-community/netbox/pull/22078
• https://github.com/netbox-community/netbox/pull/22170
• https://github.com/netbox-community/netbox/releases/tag/v4.6.1
• https://www.vulncheck.com/advisories/netbox-rce-via-rendertemplatemixin

CWEs

CWE-183