How to fix or mitigate CVE-2026-22208?

Within 24 hours: Identify all systems running OpenS100 and isolate them from production networks if possible; disable S-100 file uploads and restrict access to trusted sources only. Within 7 days: Implement network segmentation to limit lateral movement from compromised OpenS100 instances; deploy web application firewall rules to block suspicious Lua interpreter invocations; establish continuous monitoring for exploitation attempts. Within 30 days: Migrate to a patched version immediately upon release; conduct forensic analysis of all OpenS100 systems for signs of compromise; review access logs for unauthorized file processing.

CVE-2026-22208

Q: What is the CVSS score of CVE-2026-22208?

CVE-2026-22208 has a CVSS 4.0 base score of 9.4 (Critical). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.2%.

CRITICAL

Exposed Dangerous Method or Function (CWE-749)

2026-02-17 disclosure@vulncheck.com

RCE

9.4

CVSS 4.0 · Vendor: vulncheck

Severity by source

Vendor (vulncheck) PRIMARY

9.4 CRITICAL

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (vulncheck) · only source for this CVE.

CVSS VectorVendor: vulncheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Re-analysis Queued

May 26, 2026 - 14:22 vuln.today

cvss_changed

CVSS changed

May 26, 2026 - 14:22 NVD

9.6 (CRITICAL) 9.4 (CRITICAL)

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 17, 2026 - 15:16 nvd

CRITICAL 9.6

DescriptionCVE.org

OpenS100 (the reference implementation S-100 viewer) prior to commit 753cf29 contain a remote code execution vulnerability via an unrestricted Lua interpreter. The Portrayal Engine initializes Lua using luaL_openlibs() without sandboxing or capability restrictions, exposing standard libraries such as 'os' and 'io' to untrusted portrayal catalogues. An attacker can provide a malicious S-100 portrayal catalogue containing Lua scripts that execute arbitrary commands with the privileges of the OpenS100 process when a user imports the catalogue and loads a chart.

AnalysisAI

Remote code execution in OpenS100 (S-100 viewer reference implementation) prior to commit 753cf29. Malicious S-100 dataset files can trigger code execution when opened. CVSS 9.6.