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.fil
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | upsonic | < 0.56.0 | 0.56.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-6278
- https://github.com/Upsonic/Upsonic/issues/356
- https://github.com/Upsonic/Upsonic/pull/360
- https://github.com/Upsonic/Upsonic/commit/a54529acc6e4bfe28f4f5c80c058144348a306b7
- https://github.com/Upsonic/Upsonic
- https://github.com/Upsonic/Upsonic/blob/v0.55.6/src/upsonic/server/markdown/server/server.py#L39
- https://github.com/pypa/advisory-database/tree/main/vulns/upsonic/PYSEC-2025-67.yaml
- https://vuldb.com/?ctiid.313282
- https://vuldb.com/?id.313282
- https://vuldb.com/?submit.593096
- https://github.com/advisories/GHSA-8jf4-fcjr-68c2
- 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
upsonic- Disclosed
- 19.06.2025
- Updated
- 11.10.2026 12:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8jf4-fcjr-68c2 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2025-67 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: upsonic
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
- 3
- First → latest
- 06.2025 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 1
Disclosures per year
- 2025: 2
- 2026: 1
-
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.fil this entry
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