Path Traversal in Upsonic

CVE-2025-6278

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.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.007 (48.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

  • Upsonic
  • N/a Upsonic — versions 0.55.0, 0.55.1, 0.55.2

Weakness classification (CWE)

References

  • cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
  • cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
  • cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
  • cna@vuldb.com (issue-tracking, Exploit, exploit)

Frequently asked questions

What is CVE-2025-6278?
CVE-2025-6278 is a medium-severity vulnerability in Upsonic, classified under Path Traversal. CVSS score: 5.5/10. Published 2025-06-19.
How severe is CVE-2025-6278?
Medium severity. CVSS v3 base score is 5.5 out of 10.