7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-54796

CVE-2025-54796: copyparty allows Regex Denial of Service (ReDoS) in the upload listing

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-54796

CVE-2025-54796:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
copyparty	pip	<= 1.18.8	1.18.9

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability exists in two functions, tx_ups and tx_rups, within the copyparty/httpcli.py file. Both functions are responsible for handling and listing uploads and allow filtering based on a user-provided parameter named 'filter'. The core of the vulnerability lies in the fact that this 'filter' string is directly used to compile a regular expression without any sanitization or validation. An attacker can craft a malicious regular expression pattern that leads to catastrophic backtracking, a condition where the regex engine takes an extremely long time to process a string, effectively causing a Denial of Service (DoS). The provided patch remediates this by removing the regex compilation and search (re.compile and filt.search) and replacing it with a safe, custom string anchoring logic (str_anchor) that only allows simple startswith and endswith checks, thus eliminating the possibility of a ReDoS attack.

Vulnerable functions

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Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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