CVE-2026-70657: 9001 Copyparty

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Copyparty is a portable file server. Prior to 1.20.17, copyparty volumes with the dk or dks directory-key flag combined with the fk or fka file-key flag can convert a valid file key into a directory key, granting read access to the containing folder. This vulnerability was only reachable if both types of keys (filekeys and dirkeys) were manually enabled in the volume flags simultaneously. This issue is fixed in version 1.20.17.

Affected products

• 9001 Copyparty: before 1.20.17 (fixed in 1.20.17)

Published 2026-08-18. Last modified 2026-09-18.