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CVE-2025-54796 — Copyparty is vulnerable to Regex Denial of Service (ReDoS) attacks through "Recent Uploads" page

Affected: 9001 copyparty

Copyparty is a portable file server. Versions prior to 1.18.9, the filter parameter for the "Recent Uploads" page allows arbitrary RegExes. If this feature is enabled (which is the default), an attacker can craft a filter which deadlocks the server. This is fixed in version 1.18.9.

GHSA-5662-2rj7-f2v6 — copyparty allows Regex Denial of Service (ReDoS) in the upload listing

Affected: PyPI: copyparty

### Summary The `filter` parameter for the "Recent uploads" page allows arbitrary Regexes. If this feature is enabled (which is the default), an attacker can craft a filter which deadlocks the server.

### PoC `https://127.0.0.1:3923/?ru&filter=(.+)+x`

### Impact The server becomes fully inaccessible for a long time.

PYSEC-2026-1275 — copyparty allows Regex Denial of Service (ReDoS) in the upload listing

Affected: PyPI: copyparty

### PoC `https://127.0.0.1:3923/?ru&filter=(.+)+x`

### Impact The server becomes fully inaccessible for a long time.