What’s Vulnerable › Vulnerabilities

CVE-2026-29514: NetBox 4.3.5 - 4.5.4 RCE via RenderTemplateMixin

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-04 · updated 2026-06-17
• Weakness: CWE-183

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.

Affected products

• netbox-community netbox: from 4.3.5 through 4.5.4

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

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