CVE-2026-22208 OpenS100 Portrayal Engine Unrestricted Lua Standard Library Access
Attackers can execute arbitrary code via malicious Lua scripts in S-100 portrayal catalogues due to unrestricted Lua library access in OpenS100.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-22208?
CVE-2026-22208 is a critical code injection vulnerability in OpenS100, published on 17 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Which versions are affected by CVE-2026-22208?
How do I fix CVE-2026-22208?
No fix has been published for CVE-2026-22208 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-22208 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22208 exists.
Sources
Also known as GHSA-vq48-824m-7qhf.