What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-17 · updated 2026-07-14
• Weakness: CWE-749

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.

References

• https://github.com/S-100ExpertTeam/OpenS100/commit/753cf294434e8d3961f20a567c4d99151e3b530d
• https://www.mdpi.com/1424-8220/26/4/1246
• https://www.vulncheck.com/advisories/opens100-portrayal-engine-unrestricted-lua-standard-library-access

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