Is CVE-2026-83603 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-83603 being exploited in the wild.

How severe is CVE-2026-83603?

High severity, with a CVSS score of 8.4, published 22 September 2026.

Is there a fix for CVE-2026-83603?

A patch was published on 2026-06-16: Fixed in version 2.10.4 and nightly build 2.10.0-782-nightly Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-83603 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-83603?

Check whether you run Netdata at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-83603: Netdata ndsudo privilege escalation via fail2ban socket

CVE-2026-83603 · Severity: high · CVSS 8.4 · Published 2026-09-22

Netdata is an open source monitoring and observability platform. A setuid-root helper command in Netdata prior to 2.10.4 accepts caller-controlled socket paths and passes data to Python's pickle.loads(), allowing arbitrary code execution as root on systems with fail2ban-client installed. An attacker with access to the low-privileged netdata service account can exploit this to gain root-level control.

Technologies: Netdata. Vendors: Netdata.

Quick answers

Is CVE-2026-83603 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-83603 being exploited in the wild.
How severe is CVE-2026-83603?: High severity, with a CVSS score of 8.4, published 22 September 2026.
Which products and versions are affected?: Netdata prior to 2.10.4.
Is there a fix for CVE-2026-83603?: A patch was published on 2026-06-16: Fixed in version 2.10.4 and nightly build 2.10.0-782-nightly Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-83603 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-83603?: Check whether you run Netdata at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The ndsudo setuid-root helper in src/collectors/utils/ndsudo.c accepts an attacker-controlled --socket_path parameter from the netdata service account and passes it to fail2ban-client. The fail2ban/client/csocket.py CSocket.receive() method deserializes returned data with pickle.loads() without validation, enabling arbitrary code execution as root. This requires fail2ban-client to be installed and accessible, and the netdata service to be running.

Affected products

Netdata Netdata prior to 2.10.4

Timeline

2026-09-22: disclosed
2026-06-16: patched: Fixed in version 2.10.4 and nightly build 2.10.0-782-nightly

References

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