# CVE-2025-33213: Deserialization in Merlin Transformers4Rec

> A deserialization vulnerability in NVIDIA Merlin Transformers4Rec allows attackers to execute code, cause denial of service, or tamper with data.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A: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:** 9 Dec 2025
- **Updated:** 9 Dec 2025
- **Also known as:** GHSA-4g4q-v35j-pfp4

## What is CVE-2025-33213?

CVE-2025-33213 is a high-severity unsafe deserialization vulnerability in NVIDIA Merlin Transformers4Rec, published on 9 Dec 2025. 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

NVIDIA Merlin Transformers4Rec for Linux contains a vulnerability in the Trainer component, where a user could cause a deserialization issue. A successful exploit of this vulnerability might lead to code execution, denial of service, information disclosure, and data tampering.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2025-33213?


## How do I fix CVE-2025-33213?

No fix has been published for CVE-2025-33213 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-33213 being exploited?

There is no known exploitation of CVE-2025-33213 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-33213 and fix it if it is affected.

What it is: CVE-2025-33213 is a high-severity unsafe deserialization vulnerability in NVIDIA Merlin Transformers4Rec, published on 9 Dec 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-33213 in the wild and no public exploit code.

Affected product: NVIDIA Merlin Transformers4Rec. 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-2025-33213/ (Markdown: https://insights.sbomify.com/CVE-2025-33213/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-33213
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-33213
- OSV: https://osv.dev/vulnerability/CVE-2025-33213

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-33213/
Summaries are generated and may contain mistakes; the official description above is the record.