dash-uploader has a directory traversal vulnerability
Impact
An unauthenticated path traversal vulnerability exists in dash-uploader versions 0.1.0 through 0.7.0a2. The library's HTTP request handler at dash_uploader/httprequesthandler.py reads three form parameters (upload_id, resumableFilename, resumableIdentifier) from request.form.get() and passes them directly to os.path.join() and os.makedirs() without any sanitization.
A single unauthenticated POST /API/dash-uploader request with upload_id set to a relative path (e.g. ../../etc/cron.d or ../venv/lib/python3.13/site-packages) escapes the application's uploads/ directory and writes the supplied file content to the chosen target path under the privilege of the gunicorn / WSGI process.
When the chosen target is a Python site-packages directory and the dropped file is a .pth file containing an import-prefixed line, Python's site module executes that line on the next interpreter startup, yielding remote code execution. Other escalation paths reachable from the same primitive include overwriting the running WSGI module, dropping ~/.ssh/authorized_keys, or writing JavaScript into a Dash-served assets/ directory for stored XSS.
Affected versions
All 16 published PyPI releases (0.1.0 through 0.7.0a2) are affected. The package repository was archived on 2025-07-19; no patched version exists.
Mitigation
Replace dash-uploader with an alternative file-upload component (for example, dash-resumable-upload, server-rendered <input type=\"file\"> plus a hardened Flask endpoint, or a maintained Dash community alternative). There is no upstream fix path.
While a replacement is being deployed, mitigations include:
- Block
POST /API/dash-uploaderat an upstream proxy, OR - Run the application as an unprivileged user with no write access to its own
site-packages, OR - Use a read-only filesystem for the application's code directories.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | dash-uploader | >= 0.1.0, <= 0.7.0a2 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-38360
- https://github.com/fohrloop/dash-uploader/issues/153
- https://github.com/a1ohadance/CVE-2026-38360
- https://github.com/fohrloop/dash-uploader
- https://github.com/fohrloop/dash-uploader/blob/dev/dash_uploader/httprequesthandler.py
- https://github.com/fohrloop/dash-uploader/blob/stable/dash_uploader/httprequesthandler.py
- https://github.com/lmigtech/dash_uploader
- https://pypi.org/project/dash-uploader
- https://github.com/advisories/GHSA-3rf6-x59v-5jfv
- https://github.com/github/advisory-database/pull/7635
- https://github.com/pypa/advisory-database/tree/main/vulns/dash-uploader/PYSEC-2026-320.yaml
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-22- Platform
- Python (PyPI)
- Package
dash-uploader- Disclosed
- 08.05.2026
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-320 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-3rf6-x59v-5jfv - CC BY 4.0
Vulnerability history: dash-uploader
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 05.2026 05.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 1
Disclosures per year
- 2026: 2
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dash-uploader has a directory traversal vulnerability this entry
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