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TI-2025-34551 Aliases CVE-2025-54796GHSA-5662-2rj7-f2v6

Copyparty is vulnerable to Regex Denial of Service (ReDoS) attacks through "Recent Uploads" page

Priority HIGH 72CWE-1333Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00495 42nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed copyparty (9001): 1.18.9copyparty (PyPI): 1.18.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
9001copypartybefore 1.18.91.18.9Patch availableCNA
—copyparty (PyPI)before 1.18.91.18.9Patch availableGHSA-5662-2rj7-f2v6
  • copyparty Vendor9001 Affected before 1.18.9 Fixed in 1.18.9 Patch available CNA
  • copyparty (PyPI) Vendor— Affected before 1.18.9 Fixed in 1.18.9 Patch available GHSA-5662-2rj7-f2v6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:9001:copyparty:*:*:*:*:*:*:*:*before 1.18.9Vulnerable9001
  • cpe:2.3:a:9001:copyparty:*:*:*:*:*:*:*:* Versions before 1.18.9 Vulnerable ·9001

Remediation

  • Fix · CNA copyparty (9001) Fixed in 1.18.9
  • Fix · GHSA-5662-2rj7-f2v6 copyparty (PyPI) Fixed in 1.18.9 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-54796
  2. 2026-10-03 Alias added: GHSA-5662-2rj7-f2v6

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2023-19082 Path traversal in copyparty CVSS 3.1HIGH 7.5
  • TI-2023-21990 Cross Site Scripting vulnerability in copyparty before 1.9.2 allows a local attacker to… CVSS 3.1HIGH 7.8
  • TI-2023-19881 copyparty vulnerable to reflected cross-site scripting via k304 parameter CVSS 3.1MEDIUM 6.3
  • TI-2025-34228 copyparty has a DOM-Based XSS vulnerability when displaying multimedia metadata CVSS 3.1MEDIUM 6.1
  • TI-2025-20002 copyparty renders unsanitized filenames as HTML when user uploads empty files CVSS 3.1MEDIUM 6.1
  • TI-2025-34360 copyparty Reflected XSS via Filter Parameter CVSS 3.1MEDIUM 6.3
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences