# CVE-2026-31218: Nebuly AI Optimate insecure deserialization in neural_magic_training.py

Source: https://junglewise.ai/threats/cve-2026-31218-nebuly-ai-optimate-insecure-deserialization-in-neural-magic  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-12. Updated: 2026-05-14  
License: CC BY 4.0 with a link back

CVE-2026-31218 · Severity: info · CVSS 0 · Published 2026-05-12

Nebuly AI Optimate is a collection of libraries used to optimize the performance of AI models. A security vulnerability exists in how the software handles model files, allowing a malicious actor to execute unauthorized commands on a user's system. This occurs when the software processes a specially crafted model file, potentially leading to a full system compromise or data theft.

Technologies: [Nebuly AI Optimate](https://junglewise.ai/threats/technologies/optimate). Vendors: [Nebuly AI](https://junglewise.ai/threats/vendors/nebuly-ai).

## Quick answers

**Is CVE-2026-31218 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-31218 being exploited in the wild.

**How severe is CVE-2026-31218?** Informational severity, with a CVSS score of 0, published 12 May 2026.

**Which products and versions are affected?** Nebuly AI Optimate commit a6d302f912b481c94370811af6b11402f51d377f.

**Is there a fix for CVE-2026-31218?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-31218 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-31218?** Check whether you run Nebuly AI Optimate at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The _load_model() function in neural_magic_training.py within the Optimate project (specifically commit a6d302f) is vulnerable to insecure deserialization (CWE-502). The vulnerability exists because the code calls torch.load() on a state_dict.pt file without setting the weights_only=True parameter. Since torch.load() uses the Python pickle module by default, it can be coerced into deserializing arbitrary Python objects. An attacker can exploit this by providing a maliciously crafted state_dict.pt file via the --model argument, resulting in arbitrary code execution with the privileges of the user running the script.

## Affected products

- Nebuly AI optimate commit a6d302f912b481c94370811af6b11402f51d377f

## Timeline

- 2024-07-21: other: Vulnerable commit date
- 2026-05-12: disclosed: NVD publication date

## References

- [https://github.com/nebuly-ai/optimate](https://github.com/nebuly-ai/optimate)
- [https://www.notion.so/CVE-2026-31218-35d1e139318881839bc8cf6007be2c76](https://www.notion.so/CVE-2026-31218-35d1e139318881839bc8cf6007be2c76)

## Related threats

- [Nebuly AI Optimate arbitrary code execution in neural_magic_training.py](https://junglewise.ai/threats/cve-2026-31217-nebuly-ai-optimate-arbitrary-code-execution-in-neural-magic)