CVE-2026-22208

OpenS100 Portrayal Engine Unrestricted Lua Standard Library Access

State: Published
Severity: 9.4 Critical
Published: Feb 17, 2026
Updated: Jul 14, 2026
Reserved: Jan 6, 2026

Description

OpenS100 (the reference implementation S-100 viewer) prior to commit 753cf29 contains 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.

Scores

CVSS	Score	Vector	Source
4.0	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	VulnCheck
3.1	9.6 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-749 Exposed Dangerous Method or Function
CWE-829 Inclusion of Functionality from Untrusted Control Sphere

Affected Products

Product	Versions
OpenS100OpenS100 Project	before 753cf294434e8d3961f20a567c4d99151e3b530dAffected

References

https://www.mdpi.com/1424-8220/26/4/1246technical-descriptionexploit
https://github.com/S-100ExpertTeam/OpenS100/commit/753cf294434e8d3961f20a567c4d99151e3b530dpatch
https://www.vulncheck.com/advisories/opens100-portrayal-engine-unrestricted-lua-standard-library-accessthird-party-advisory

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