# 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.

- **Severity:** Critical 9.4 (`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`)
- **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 available:** No
- **Published:** 17 Feb 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-vq48-824m-7qhf

## 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.

Weakness: CWE-829 (Inclusion of Functionality from Untrusted Control Sphere), CWE-749 (Exposed Dangerous Method or Function)

## 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.

## Is CVE-2026-22208 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22208 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-22208 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22208 exists.

Affected product: OpenS100. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-22208/ (Markdown: https://insights.sbomify.com/CVE-2026-22208/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-22208
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-22208
- OSV: https://osv.dev/vulnerability/CVE-2026-22208

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-22208/
Summaries are generated and may contain mistakes; the official description above is the record.