Bug 2538314 (CVE-2026-83603)

Summary: CVE-2026-83603 netdata: Netdata: Local Root Privilege Escalation via ndsudo and fail2ban-client arbitrary socket path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Netdata. The ndsudo helper command, which operates with root privileges, can be exploited by a low-privileged Netdata service account. This account can direct the root fail2ban-client to a malicious UNIX socket. Consequently, attacker-controlled code can be executed with root privileges, leading to privilege escalation on systems where fail2ban-client is installed.
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Bug Depends On: 2539366    
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Description OSIDB Bzimport 2026-09-22 18:02:59 UTC 
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.