CVE-2025-6278: Upsonic

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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 products

• Upsonic Upsonic: up to and including 0.55.6

Published 2025-06-19. Last modified 2026-06-17.