CVE-2026-29514
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.78%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 4.0
- 8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.78% probability · 54th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-183
- Source
- disclosure@vulncheck.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.