CVE-2026-44796: DoS in Nautobot
Platform
python
Component
nautobot
Fixed in
3.1.2
CVE-2026-44796 describes a Denial of Service (DoS) vulnerability discovered in Nautobot. Attackers can trigger this vulnerability by crafting malicious regular expressions within the find field of UI object-bulk-rename endpoints, combined with the use_regex flag. This can lead to an application-wide denial of service, rendering the Nautobot interface unresponsive. The vulnerability affects versions of Nautobot up to 3.1.1, and a fix is available in version 3.1.2.
Detect this CVE in your project
Upload your requirements.txt file and we'll tell you instantly if you're affected.
Impact and Attack Scenarios
The primary impact of CVE-2026-44796 is a denial of service. A successful exploit can overwhelm the Nautobot application with regular expression evaluation, preventing legitimate users from accessing and managing network devices and configurations. This disruption can significantly impact network operations and troubleshooting efforts. The vulnerability lies within the UI object-bulk-rename endpoints, specifically when the use_regex flag is enabled alongside a malicious find parameter. The regular expression engine's inability to handle complex or poorly formed patterns can lead to excessive resource consumption and application instability. The blast radius is the entire Nautobot application, potentially impacting all users.
Exploitation Context
CVE-2026-44796 was published on May 13, 2026. The vulnerability's severity is rated as Medium. No public proof-of-concept (POC) code has been publicly disclosed at the time of writing. There are no indications of active exploitation campaigns targeting this vulnerability. The NVD and CISA databases reflect the publication date.
Threat Intelligence
Exploit Status
CVSS Vector
What do these metrics mean?
- Attack Vector
- Network — remotely exploitable over the internet. No physical or local access required. Widest attack surface.
- Attack Complexity
- Low — no special conditions required. Attacker can exploit reliably without depending on rare configurations or timing.
- Privileges Required
- Low — any valid user account is sufficient. Basic authenticated access required.
- User Interaction
- None — attack is automatic and silent. Victim does nothing: no click, no file open.
- Scope
- Unchanged — impact is limited to the vulnerable component itself.
- Confidentiality
- None — no confidentiality impact. Attacker cannot read protected data.
- Integrity
- None — no integrity impact. Attacker cannot modify data.
- Availability
- High — complete crash or resource exhaustion. Full denial of service.
Affected Software
Timeline
- Published
Mitigation and Workarounds
The recommended mitigation for CVE-2026-44796 is to upgrade to Nautobot version 3.1.2 or later. This version introduces a general-purpose timeout to the affected endpoints, preventing regular expression evaluation from continuing indefinitely. If upgrading is not immediately feasible, consider restricting access to the /dcim/interfaces/rename/ and similar endpoints to trusted users only. While a direct workaround isn't available, careful input validation on the find field could offer limited protection, but is not a substitute for patching. After upgrading, confirm the fix by attempting to trigger the vulnerability with a known malicious regular expression and verifying that the request times out as expected.
How to fix
No official patch available. Check for workarounds or monitor for updates.
Frequently asked questions
What is CVE-2026-44796 — DoS in Nautobot?
CVE-2026-44796 is a Denial of Service vulnerability in Nautobot affecting versions up to 3.1.1. It allows attackers to cause a denial of service by exploiting regular expression handling in UI bulk-rename endpoints.
Am I affected by CVE-2026-44796 in Nautobot?
You are affected if you are running Nautobot version 3.1.1 or earlier. The vulnerability lies in how the application handles regular expressions in specific UI endpoints.
How do I fix CVE-2026-44796 in Nautobot?
Upgrade to Nautobot version 3.1.2 or later. This version includes a timeout mechanism to prevent indefinite regular expression evaluation and mitigate the DoS vulnerability.
Is CVE-2026-44796 being actively exploited?
There are currently no public reports or indications of active exploitation campaigns targeting CVE-2026-44796.
Where can I find the official Nautobot advisory for CVE-2026-44796?
Refer to the Nautobot security advisories page for the latest information and official announcements regarding CVE-2026-44796: [https://nautobot.io/security/](https://nautobot.io/security/)
Is your project affected?
Upload your dependency file and we'll tell you instantly if this and other CVEs hit you.
Detect this CVE in your project
Upload your requirements.txt file and we'll tell you instantly if you're affected.
Scan your Python project now — no account
Upload your requirements.txt and get the vulnerability report instantly. No account. Uploading the file is just the start: with an account you get continuous monitoring, Slack/email alerts, multi-project and white-label reports.
Drag & drop your dependency file
composer.lock, package-lock.json, requirements.txt, Gemfile.lock, pubspec.lock, Dockerfile...