CVE-2026-83603

Netdata: Local Root via ndsudo Arbitrary socket_path → fail2ban-client Pickle RCE

8.4 HighPublic exploit

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: None

Exploit likelihood

0.32%Unchanged since Sep 23, 2026

What each source reports

CVE List Score used 8.4

Netdata: Local Root via ndsudo Arbitrary socket_path → fail2ban-client Pickle RCE

Record: CVE-2026-83603
CVSS 3.1: 8.4 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Weakness: CWE-73, CWE-502
Updated: 2026-11-02

EUVDEUVD-2026-84564 8.4

Record: EUVD-2026-84564
CVSS 3.1: 8.4 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Updated: 2026-11-02

NVD 8.4

Record: CVE-2026-83603
CVSS 3.1: 8.4 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Weakness: CWE-73, CWE-502
Updated: 2026-11-02

OSV 8.4

Netdata: Local Root via ndsudo Arbitrary socket_path → fail2ban-client Pickle RCE

Record: CVE-2026-83603
CVSS 3.1: 8.4 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Weakness: CWE-502, CWE-73
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-83603 8.4

Record: DEBIAN-CVE-2026-83603
CVSS 3.1: 8.4 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-83603 8.4

Record: UBUNTU-CVE-2026-83603
CVSS 3.1: 8.4 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Updated: 2026-11-02

Affected products

netdata

Affected packages

Affected packages
Package	Affected	Fixed
`netdata` Debian:12	All versions, plus listed versions 1.37.1-21.38.0-11.38.1-11.39.0-11.39.1-1 Show 26 moreShow less 1.39.1-21.40.0-11.40.0-21.40.1-11.41.0-11.42.0-11.42.1-11.42.2-11.42.3-11.42.4-11.43.0-11.43.1-11.43.2-11.44.3-11.44.3-21.46.3-11.46.3-21.47.0-11.47.1-11.47.2-11.47.5-12.0.3+dfsg-12.0.3+dfsg-22.0.3+dfsg-32.0.3+dfsg-42.0.3+dfsg-5	None known
`netdata` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 1.7.0+dfsg-11.8.0+dfsg-11.9.0+dfsg-11.9.0+dfsg-1ubuntu0.1~esm1	None known
`netdata` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 1.16.1-21.19.0-3ubuntu11.19.0-3ubuntu1+esm1	None known
`netdata` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 1.29.3-41.31.0-41.33.1-1ubuntu11.33.1-1ubuntu1+esm1	None known
`netdata` Ubuntu:24.04:LTS	All versions, plus listed versions 1.42.1-11.43.1-11.43.2-11.43.2-1build11.43.2-1build2	None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	OhWelp/CVE-2026-83603-LPE-PoC	2026-09-02

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-83603 is a high vulnerability (CVSS 8.4) in Netdata, published September 22, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 25th percentile. No source names a fixed version.