# CVE-2025-33247: Deserialization in Megatron LM

> Remote attackers can achieve code execution and privilege escalation via unsafe deserialization in NVIDIA Megatron LM quantization configuration loading.

- **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 Mar 2026
- **Updated:** 25 Mar 2026
- **Also known as:** GHSA-qm3j-hh5g-jmq2

## What is CVE-2025-33247?

CVE-2025-33247 is a high-severity unsafe deserialization vulnerability in NVIDIA Megatron LM, published on 24 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

NVIDIA Megatron LM contains a vulnerability in quantization configuration loading, which could allow remote code execution. A successful exploit of this vulnerability might lead to code execution, escalation of privileges, information disclosure, and data tampering.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2025-33247?

It affects 1 product.


Products: Nvidia Megatron-Lm.

## How do I fix CVE-2025-33247?

No fix has been published for CVE-2025-33247 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-33247 being exploited?

There is no known exploitation of CVE-2025-33247 in the wild and no public exploit code.

## Other vulnerabilities in NVIDIA Megatron LM

- [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)
- [CVE-2025-23348](https://insights.sbomify.com/CVE-2025-23348/): Code injection in Megatron-LM (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-33247 and fix it if it is affected.

What it is: CVE-2025-33247 is a high-severity unsafe deserialization vulnerability in NVIDIA Megatron LM, published on 24 Mar 2026. 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-2025-33247 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-2025-33247/ (Markdown: https://insights.sbomify.com/CVE-2025-33247/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-33247
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-33247
- OSV: https://osv.dev/vulnerability/CVE-2025-33247

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-33247/
Summaries are generated and may contain mistakes; the official description above is the record.