high CVSS 7.1

CVE-2025-49142·Python vulnerability

Nautobot is a Network Source of Truth and Network Automation Platform. All users of Nautobot versions prior to 2.4.10 or prior to 1.6.32 are potentially affected. Due to insufficient security configuration of the Jinja2 templating feature used in computed fields, custom links, etc. in Nautobot, a malicious user could configure this feature set in ways that could expose the value of Secrets defined in Nautobot when the templated content is rendered or that could call Python APIs to modify data within Nautobot when the templated content is rendered, bypassing the object permissions assigned to the viewing user. Nautobot versions 1.6.32 and 2.4.10 will include fixes for the vulnerability. The vulnerability can be partially mitigated by configuring object permissions appropriately to limit certain actions to only trusted users.

Severity
high
Software
Python
Fixed in
2.4.10
Published
2025-06-10

Affected versions

From: 2.0.0

Until: 2.4.10

Fixed in: 2.4.10

How to fix this CVE

Upgrade Nautobot to version 2.4.10 or later to patch a Jinja2 template injection vulnerability that could leak sensitive data or allow unauthorized modification of database records. This vulnerability affects computed fields, custom links, and other templated features in Nautobot versions 2.0.0 through 2.4.9. Ensure object permissions are properly configured to restrict template configuration access to trusted administrators only.

sudo dnf update python3-nautobot

Defensia detects this vulnerability

How to check if you are affected

  1. Check Nautobot version: curl -s http://localhost:8000/api/version/ | grep -i version or check /opt/nautobot/VERSION file
  2. Identify if Jinja2 templating is enabled: grep -r 'ENABLE_COMPUTED_FIELDS\|CUSTOM_LINKS' /opt/nautobot/nautobot/settings.py
  3. Search Nautobot logs for template rendering errors: grep -i 'jinja\|template\|sandbox' /var/log/nautobot/*.log | grep -i 'error\|exception'
  4. Verify the fix by confirming Nautobot version is 2.4.10 or later: python3 -m pip show nautobot | grep Version

FAQ

What is CVE-2025-49142?

CVE-2025-49142 is a template injection vulnerability in Nautobot's Jinja2 templating engine used for computed fields and custom links. An authenticated attacker with template configuration privileges can inject malicious code to expose secrets or manipulate database records without proper authorization checks.

Is CVE-2025-49142 being actively exploited?

No, CVE-2025-49142 is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog and no public exploits are currently available. However, the vulnerability requires authentication and configuration access, limiting the attack surface.

What versions of Nautobot are affected by CVE-2025-49142?

Nautobot versions 2.0.0 through 2.4.9 are affected. The vulnerability has been patched in version 2.4.10 and later, as well as in the 1.6.32 maintenance release.

How do I check if my server is vulnerable to CVE-2025-49142?

Run 'python3 -m pip show nautobot' and compare the installed version against 2.4.10. If the version is lower than 2.4.10 and within the 2.0.0-2.4.9 range, your installation is vulnerable.

Does Defensia detect CVE-2025-49142?

Yes — Defensia's CVE advisory scanner compares installed Nautobot versions against the NVD database. If Nautobot is installed on a monitored server, CVE-2025-49142 will appear in your dashboard with remediation steps and version recommendations.

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References

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