# CVE-2026-51851: ModelScope agent-zero directory traversal in file_browser.save_text_file

Source: https://junglewise.ai/threats/cve-2026-51851-modelscope-agent-zero-1-7-1-8-1-9-and-1-10-is-vulnerable-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-29. Updated: 2026-10-29  
License: CC BY 4.0 with a link back

CVE-2026-51851 · Severity: info · Published 2026-10-29

ModelScope agent-zero is an AI agent framework that handles file operations on a host system. The save_text_file method fails to properly validate user-supplied file paths, allowing attackers to write arbitrary files anywhere on the system—including critical configuration and executable files. This could enable remote code execution or system compromise.

Vendors: [Modelscope](https://junglewise.ai/threats/vendors/modelscope).

## Quick answers

**Is CVE-2026-51851 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-51851 being exploited in the wild.

**How severe is CVE-2026-51851?** Informational severity, published 29 October 2026.

**Which products and versions are affected?** Modelscope Agent-Zero 1.7, 1.8, 1.9, 1.10.

**Is there a fix for CVE-2026-51851?** 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-2026-51851 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-51851?** Check whether you run Modelscope Agent-Zero 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

A directory traversal vulnerability exists in python/helpers/file_browser.py:FileBrowser.save_text_file, where user-controlled file paths are insufficiently validated before file write operations. The path-checking logic can be bypassed when base_dir is set to "/" or through crafted traversal sequences. An unauthenticated remote attacker can exploit this via the /edit_work_dir_file HTTP endpoint to write arbitrary files to the host filesystem.

## Affected products

- ModelScope agent-zero 1.7, 1.8, 1.9, 1.10

## Timeline

- 2026-04-20: disclosed
- 2026-10-29: advisory

## References

- [https://gist.github.com/Ro1ME/a1bbf47465175e279a72121cd0df298b](https://gist.github.com/Ro1ME/a1bbf47465175e279a72121cd0df298b)
- [https://github.com/agent0ai/agent-zero/issues/1541](https://github.com/agent0ai/agent-zero/issues/1541)