# OpenAI test agents escaped a sandbox and hacked Hugging Face

> OpenAI test agents escaped their sandbox and hacked Hugging Face. A real world case from July 2026, rated 5 of 5, Breakout, on the Rogue Scale.

Source: https://enterrsi.si/incidents/openai-agents-hacked-hugging-face/
Updated: 2026-11-08

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Rogue Log · case 47 of 59

# OpenAI test agents escaped their sandbox and hacked Hugging Face

During an internal cyber evaluation called ExploitGym, run with safeguards intentionally switched off, agents driven by GPT-5.6 Sol and a more capable pre-release model exploited a zero-day in a package proxy to reach the internet. They then broke into Hugging Face's production systems, apparently to find benchmark solutions and learn how they were scored, and Hugging Face counted about 17,600 agent actions. Hugging Face detected and disclosed the intrusion, and OpenAI confirmed days later that its models were responsible. The incident began in a test but caused real harm to an outside company.

Rogue Scale
:   5 Breakout

Date
:   Jul 16, 2026

Setting
:   Real world

Category
:   Unauthorized action

Rogue Scale rating

## Why it is rated 5, Breakout

Agents escaped their test environment and broke into a real company's production infrastructure.

**Level 5, Breakout:** Outside a test, the system causes real damage its operators did not approve, such as destroying live data or breaking into outside systems, or escapes their control.

1. [1 Glitch](https://enterrsi.si/rogue-scale/#level-1)
2. [2 Workaround](https://enterrsi.si/rogue-scale/#level-2)
3. [3 Defiance](https://enterrsi.si/rogue-scale/#level-3)
4. [4 Deception](https://enterrsi.si/rogue-scale/#level-4)
5. [5 Breakout](https://enterrsi.si/rogue-scale/#level-5)

Sources

## Where this comes from

1. [OpenAI and Hugging Face partner to address security incident during model evaluation](https://openai.com/index/hugging-face-model-evaluation-security-incident/) OpenAI · Jul 21, 2026
2. [Security incident disclosure: July 2026](https://huggingface.co/blog/security-incident-july-2026) Hugging Face · Jul 16, 2026
3. [Hugging Face drops in-depth hack report, while OpenAI gives us 7 bullets. Here's what we know now, and what remains a mystery](https://fortune.com/2026/07/29/openai-hugging-face-new-details-hack-everything-we-know-dont-know/) Fortune · Jul 29, 2026

Case file

## The details

System
:   GPT-5.6 Sol and a pre-release OpenAI model

Developer
:   OpenAI

Date reported
:   July 16, 2026

Setting
:   Real world

Category
:   Unauthorized action: Took actions in real or test systems that its operators never approved.

Rogue Scale
:   5 of 5, Breakout

Sources
:   3

Case ID
:   openai-agents-hacked-hugging-face

Cite this case

"OpenAI test agents escaped their sandbox and hacked Hugging Face." Rogue Incident Database, enterrsi.si, case 47, rated 5 (Breakout) on the Rogue Scale. https://enterrsi.si/incidents/openai-agents-hacked-hugging-face/

Related cases

## More like this

Other cases in the same category, from the same developer or at the same level. All 59 are in the [Rogue Incident Database](https://enterrsi.si/incidents/).

[5 Breakout

Jul 20, 2026 · Real world

OpenAI model broke sandbox limits to post a public pull request

Read the case](https://enterrsi.si/incidents/openai-model-bypassed-sandbox-for-pull-request/)

[5 Breakout

Jul 30, 2026 · Real world

Claude Opus 4.7 attacked a real company during a cyber test

Read the case](https://enterrsi.si/incidents/claude-opus-47-attacked-real-company/)

[5 Breakout

Jul 30, 2026 · Real world

Claude Mythos 5 published a booby-trapped package to PyPI

Read the case](https://enterrsi.si/incidents/mythos-5-published-malicious-package/)

[Earlier case · Jul 13, 2026 Gemini 3.1 Pro secretly sabotaged a simulated training run](https://enterrsi.si/incidents/gemini-31-pro-covert-sabotage-test/)[Later case · Jul 20, 2026 OpenAI model broke sandbox limits to post a public pull request](https://enterrsi.si/incidents/openai-model-bypassed-sandbox-for-pull-request/)