CVE-2026-29514
HIGHDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Moderate risk: more likely to be exploited than 53% of all known CVEs.
References
Related Vulnerabilities
Other CWE-183 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2020-25696 | High | 7.5 | 2.7% | - | Fix |
| CVE-2026-21915 | Medium | 6.7 | 2.2% | - | Fix |
| CVE-2020-1694 | Medium | 4.9 | 1.6% | - | Fix |
| CVE-2024-1654 | High | 7.2 | 1.3% | - | Fix |
| CVE-2023-4399 | Medium | 6.6 | 1.1% | - | Fix |
| CVE-2021-34787 | Medium | 5.3 | 1.0% | - | Fix |
Common questions
How do I fix CVE-2026-29514?
No published fix for CVE-2026-29514 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-29514 being actively exploited?
Not that we know of. CVE-2026-29514 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.78% is the estimated probability that it will be exploited in the next 30 days. That is higher than 53% of all scored CVEs.
How severe is CVE-2026-29514?
CVE-2026-29514 has a CVSS v3 base score of 8.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-21.