medium5.3
CVE-2026-104102
copyparty FTP: upload outside defined volumes (limited path traversal)
Impact
copyparty is a portable file server. Prior to 1.20.19, FTP upload path handling does not confine destinations to configured copyparty volumes. When FTP or FTPS is explicitly enabled, a low-privileged authenticated user can submit traversal paths during upload to create a new file outside configured volumes wherever the copyparty process has write permission. The attacker cannot read or overwrite files, the output name receives a randomized suffix, and copyparty does not execute the file; however, unrelated software on the same host could process the newly created file. This issue is fixed in version 1.20.19.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | copyparty | < 1.20.19 | 1.20.19 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-phv8-wgjp-g4p9
- https://github.com/9001/copyparty/security/advisories/GHSA-phv8-wgjp-g4p9
- https://nvd.nist.gov/vuln/detail/CVE-2026-104102
- https://github.com/9001/copyparty/commit/b331bb1c8c8cc306b91e4d94221969335a7a3e86
- https://github.com/9001/copyparty/releases/tag/v1.20.19