# CVE-2025-6278: Upsonic is vulnerable to Path Traversal attack through its os.path.join function

Source: https://junglewise.ai/threats/cve-2025-6278-upsonic-is-vulnerable-to-path-traversal-attack-through-its-os-path  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-06-19  
License: CC BY 4.0 with a link back

CVE-2025-6278 · Severity: low · CVSS 3.1 · Published 2025-06-19

A vulnerability classified as critical was found in Upsonic up to 0.55.6. This vulnerability affects the function os.path.join of the file markdown/server.py. The manipulation of the argument file.filename leads to path traversal. The exploit has been disclosed to the public and may be used.

Technologies: [upsonic (PyPI)](https://junglewise.ai/threats/technologies/upsonic). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2025-6278 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-6278 being exploited in the wild.

**How severe is CVE-2025-6278?** Low severity, with a CVSS score of 3.1, published 19 June 2025.

**Which products and versions are affected?** upsonic (PyPI) ECOSYSTEM:introduced=0,fixed=0.56.0.

**Is there a fix for CVE-2025-6278?** Yes. upsonic (PyPI): upgrade to 0.56.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-6278?** Check whether you run upsonic (PyPI) 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.

## How to fix

- upsonic (PyPI): upgrade to 0.56.0 or later

  ```sh
  pip install "upsonic>=0.56.0"
  ```


## Affected products

- upsonic (PyPI) ECOSYSTEM:introduced=0,fixed=0.56.0

## Identifiers

- CVE-2025-6278
- GHSA-8jf4-fcjr-68c2
- PYSEC-2025-67

## Related threats

- [Upsonic command injection in MCP task creation](https://junglewise.ai/threats/cve-2026-30625-upsonic-command-injection-in-mcp-task-creation)
- [Upsonic has vulnerability in Pickle Handler component that can lead to deserialization](https://junglewise.ai/threats/cve-2025-6279-upsonic-has-vulnerability-in-pickle-handler-component-that-can)