Vulnerability · Published Feb 17, 2026 · Assigned by VulnCheck

CVE-2026-22208OpenS100 Portrayal Engine Unrestricted Lua Standard Library Access

Critical 9.6

In plain English

A critical-severity security flaw in OpenS100 from OpenS100 Project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities).

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)1.1%top 34.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
OpenS100 Project	OpenS100	0 – before 753cf294434e8d3961f20a567c4d99151e3b530d

Weakness: CWE-749, CWE-829 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

https://www.mdpi.com/1424-8220/26/4/1246 technical-description, exploit
https://github.com/S-100ExpertTeam/OpenS100/commit/753cf294434e8d3961f20a567c4d99151e3b530d patch
https://www.vulncheck.com/advisories/opens100-portrayal-engine-unrestricted-lua-standard-library-access third-party-advisory