CVE-2026-83603

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.4
EG Score
8.4(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

September 22, 2026

Last Modified

September 23, 2026

Advisory Details (4)

Auto-updated Sep 22, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_commit, github_release, github.
github_release Patch Available

v2.10.4

Patch available: netdata/netdata v2.10.4

https://github.com/netdata/netdata/releases/tag/v2.10.4
github_commit

commit 9bced8d46464 (netdata/netdata)

Fix landed in netdata/netdata commit 9bced8d46464 — awaiting tagged release

https://github.com/netdata/netdata/commit/9bced8d46464bd0fe01b0b5f8c63c4ac24e9b060
github_pr

fix(go.d/fail2ban): move fail2ban socket path into ndsudo

Fix merged in netdata/netdata PR #22745 on 2026-06-16 — awaiting tagged release

https://github.com/netdata/netdata/pull/22745
github Patch Available🟡 PoC Available

Local Root via ndsudo Arbitrary socket_path → fail2ban-client Pickle RCE · Advisory · netdata/netdata · GitHub

https://github.com/netdata/netdata/security/advisories/GHSA-qwh9-pq27-993w

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 16:52 UTCEG score recompute
  2. 2026-09-24 14:04 UTCEPSS rescore
  3. 2026-09-23 18:38 UTCEG score recompute
  4. 2026-09-23 17:54 UTCEPSS rescore
  5. 2026-09-22 18:32 UTCEG score recompute
  6. 2026-09-22 17:48 UTCEG score recompute
  7. 2026-09-22 17:34 UTCEG score recompute
  8. 2026-09-22 17:10 UTCEG score recompute
  9. 2026-09-22 17:08 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-83603?
CVE-2026-83603 is a high vulnerability published on September 22, 2026. 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…
When was CVE-2026-83603 disclosed?
CVE-2026-83603 was first published in the National Vulnerability Database on September 22, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-83603 actively exploited?
CVE-2026-83603 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 74.2% of all scored CVEs.
What is the CVSS score of CVE-2026-83603?
CVE-2026-83603 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-83603?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-83603, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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