# CVE-2026-108943: ModelTC LightX2V Tokenizer cosmos3_runner.py AutoTokenizer.from_pretrained code injection

> Local attackers can execute arbitrary code via the auto_map argument in the LightX2V tokenizer's AutoTokenizer.from_pretrained function.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-j5rm-qfch-8hjp

## What is CVE-2026-108943?

CVE-2026-108943 is a medium-severity code injection vulnerability in ModelTC LightX2V, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A weakness has been identified in ModelTC LightX2V up to 0.5.0. Affected is the function AutoTokenizer.from_pretrained of the file lightx2v/models/runners/cosmos3/cosmos3_runner.py of the component Tokenizer. This manipulation of the argument auto_map causes code injection. The attack is restricted to local execution. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-108943?


## How do I fix CVE-2026-108943?

No fix has been published for CVE-2026-108943 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108943 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108943 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108943 and fix it if it is affected.

What it is: CVE-2026-108943 is a medium-severity code injection vulnerability in ModelTC LightX2V, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108943 exists.

Affected product: ModelTC LightX2V. 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-2026-108943/ (Markdown: https://insights.sbomify.com/CVE-2026-108943/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108943
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108943
- OSV: https://osv.dev/vulnerability/CVE-2026-108943

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-108943/
Summaries are generated and may contain mistakes; the official description above is the record.