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Vulnerability record · CVE-2026-83603 · published 22 September 2026

CVE-2026-83603: Deserialization of untrusted data vulnerability

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.

8.4 CVSS 3.1 High EPSS 0.35% · top 74.0% CWE-73 · CWE-73CWE-502 · Deserialization of untrusted data Awaiting Analysis
8.4CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
23 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References

LinkTags
https://github.com/netdata/netdata/commit/9bced8d46464bd0fe01b0b5f8c63c4ac24e9b060
https://github.com/netdata/netdata/pull/22745
https://github.com/netdata/netdata/releases/tag/v2.10.4
https://github.com/netdata/netdata/security/advisories/GHSA-qwh9-pq27-993w

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Source: NIST National Vulnerability Database (record CVE-2026-83603), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.