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Vulnerability · Published May 4, 2026 · Assigned by VulnCheck

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

High 8.8

In plain English

A high-severity security flaw in netbox from netbox-community. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 43.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 (as reported)

VendorProductVersions
netbox-community netbox 4.3.5 – through 4.5.4

Weakness: CWE-183 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References