# CVE-2026-2256: Command injection vulnerability in ModelScope's ms-agent

> Attackers can execute arbitrary OS commands via crafted prompts in ModelScope's ms-agent library, requiring an upgrade to mitigate.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Mar 2026
- **Updated:** 3 Mar 2026
- **Also known as:** GHSA-4gc2-344q-r2rw, PYSEC-2026-2668

## What is CVE-2026-2256?

CVE-2026-2256 is a medium-severity command injection vulnerability in ModelScope ms-agent, published on 2 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A command injection vulnerability in ModelScope's ms-agent versions v1.6.0rc1 and earlier exists, allowing an attacker to execute arbitrary operating system commands through crafted prompt-derived input.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-2256?

3 open source packages ship an affected version, including ms-agent.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `ms-agent` | PyPI | All versions to 1.6.0rc1 | None |
| `ms-agent` | PyPI | All versions to 1.6.0rc1 | None |
| `ms-agent` | PyPI | All versions to 1.6.0rc1 | None |

## How do I fix CVE-2026-2256?

No fix has been published for CVE-2026-2256 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2256 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2256 exists.

Public exploit code:

- https://github.com/Itamar-Yochpaz/CVE-2026-2256-PoC (github_poc): https://github.com/Itamar-Yochpaz/CVE-2026-2256-PoC
- https://github.com/melbratic/CVE-2026-2256-Threat-Model----ms-agent-Command-Injection (github_poc): https://github.com/melbratic/CVE-2026-2256-Threat-Model----ms-agent-Command-Injection
- CVE-2026-2256  diagram (github_poc): https://github.com/mruniversity/CVE-2026-2256-

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2256 and fix it if it is affected.

What it is: CVE-2026-2256 is a medium-severity command injection vulnerability in ModelScope ms-agent, published on 2 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2256 exists.

Affected packages and fixed versions:
- ms-agent (PyPI): affected all versions up to 1.6.0rc1; no fix listed
- ms-agent (PyPI): affected all versions up to 1.6.0rc1; no fix listed
- ms-agent (PyPI): affected all versions up to 1.6.0rc1; no fix listed

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-2026-2256/ (Markdown: https://insights.sbomify.com/CVE-2026-2256/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2256
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2256
- OSV: https://osv.dev/vulnerability/CVE-2026-2256

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2256/
Summaries are generated and may contain mistakes; the official description above is the record.