Netdata: Local Root via ndsudo Arbitrary socket_path → fail2ban-client Pickle RCE (CVE-2026-83603) | HOL Guard CVE

High · CVSS 8.4CVE-2026-83603

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

Answer in brief

CVE-2026-83603 records a High severity (CVSS 8.4) vulnerability in Netdata: Local Root via ndsudo Arbitrary socket_path → fail2ban-client Pickle RCE. The current sources do not mark it as known exploited. The current feed maps netdata/netdata (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.4
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps netdata/netdata (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
netdata/netdatageneric	<2.10.4	2.10.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for netdata/netdata.
Review the reported fix. Update netdata/netdata to 2.10.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.