# CVE-2025-62609: MLX has Wild Pointer Dereference in load_gguf()

> An attacker can cause a denial of service by providing a malicious GGUF file to the MLX library, triggering a segmentation fault.

- **Severity:** Medium 5.5 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Nov 2025
- **Updated:** 21 Nov 2025
- **Also known as:** GHSA-j842-xgm4-wf88, PYSEC-2025-139

## What is CVE-2025-62609?

CVE-2025-62609 is a medium-severity vulnerability in ml-explore mlx, published on 21 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

MLX is an array framework for machine learning on Apple silicon. Prior to version 0.29.4, there is a segmentation fault in mlx::core::load_gguf() when loading malicious GGUF files. Untrusted pointer from external gguflib library is dereferenced without validation, causing application crash. This issue has been patched in version 0.29.4.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2025-62609?

3 open source packages ship an affected version, including mlx. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mlx` | PyPI | All versions | 0.29.4 |
| `mlx` | PyPI | All versions | 0.29.4 |
| `mlx` | PyPI | All versions | 0.29.4 |

Products: Ml-Explore Mlx.

## How do I fix CVE-2025-62609?

Upgrade mlx to 0.29.4 or later.

## Is CVE-2025-62609 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-62609 exists.

## Other vulnerabilities in ml-explore mlx

- [CVE-2025-62608](https://insights.sbomify.com/CVE-2025-62608/): MLX has heap-buffer-overflow in load() (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-62609 and fix it if it is affected.

What it is: CVE-2025-62609 is a medium-severity vulnerability in ml-explore mlx, published on 21 Nov 2025. 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-2025-62609 exists.

Affected packages and fixed versions:
- mlx (PyPI): affected all versions; fixed in 0.29.4
- mlx (PyPI): affected all versions; fixed in 0.29.4
- mlx (PyPI): affected all versions; fixed in 0.29.4

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-2025-62609/ (Markdown: https://insights.sbomify.com/CVE-2025-62609/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-62609
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-62609
- OSV: https://osv.dev/vulnerability/CVE-2025-62609

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-62609/
Summaries are generated and may contain mistakes; the official description above is the record.