Vulnerability · Published Oct 12, 2026 · Assigned by GitHub_M

CVE-2026-104102copyparty FTP: upload outside defined volumes (limited path traversal)

Medium 5.3

In plain English

A medium-severity path traversal in copyparty from 9001. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.3%top 75.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	copyparty	1.20.19	GHSA-phv8-wgjp-g4p9

Affected products (as reported)

Vendor	Product	Versions
9001	copyparty	< 1.20.19

Weakness: CWE-22 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N

References

https://github.com/9001/copyparty/security/advisories/GHSA-phv8-wgjp-g4p9 x_refsource_CONFIRM
https://github.com/9001/copyparty/commit/b331bb1c8c8cc306b91e4d94221969335a7a3e86 x_refsource_MISC
https://github.com/9001/copyparty/releases/tag/v1.20.19 x_refsource_MISC