# CVE-2025-23354: Code injection in Megatron-LM

> Attackers can execute arbitrary code and escalate privileges via malicious data in the ensemble classifier script of NVIDIA Megatron-LM.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** 24 Sep 2025
- **Updated:** 24 Sep 2025
- **Also known as:** GHSA-r5hm-xgfr-3f4g

## What is CVE-2025-23354?

CVE-2025-23354 is a high-severity code injection vulnerability in NVIDIA Megatron-LM, published on 24 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

NVIDIA Megatron-LM for all platforms contains a vulnerability in the ensemble_classifer script where malicious data created by an attacker may cause an injection. A successful exploit of this vulnerability may lead to code execution, escalation of privileges, Information disclosure, and data tampering.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2025-23354?

It affects 1 product.


Products: Nvidia Megatron-Lm.

## How do I fix CVE-2025-23354?

No fix has been published for CVE-2025-23354 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-23354 being exploited?

There is no known exploitation of CVE-2025-23354 in the wild and no public exploit code.

## Other vulnerabilities in NVIDIA Megatron-LM

- [CVE-2025-33247](https://insights.sbomify.com/CVE-2025-33247/): Deserialization in Megatron LM (high 7.8)
- [CVE-2025-33248](https://insights.sbomify.com/CVE-2025-33248/): Deserialization in Megatron LM (high 7.8)
- [CVE-2026-24150](https://insights.sbomify.com/CVE-2026-24150/): Deserialization in Megatron LM (high 7.8)
- [CVE-2026-24151](https://insights.sbomify.com/CVE-2026-24151/): Deserialization in Megatron LM (high 7.8)
- [CVE-2026-24152](https://insights.sbomify.com/CVE-2026-24152/): Deserialization in Megatron LM (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-23354 and fix it if it is affected.

What it is: CVE-2025-23354 is a high-severity code injection vulnerability in NVIDIA Megatron-LM, published on 24 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-23354 in the wild and no public exploit code.

Affected product: NVIDIA Megatron-LM. 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-2025-23354/ (Markdown: https://insights.sbomify.com/CVE-2025-23354/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-23354
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-23354
- OSV: https://osv.dev/vulnerability/CVE-2025-23354

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-23354/
Summaries are generated and may contain mistakes; the official description above is the record.