CVE-2025-54796 json
Copyparty is vulnerable to Regex Denial of Service (ReDoS) attacks through "Recent Uploads" page
published last yr. modified last mo. also EUVD-2025-23411 , GHSA-5662-2rj7-f2v6 , PYSEC-2026-1275
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 42%
- public exploits
- 0
- none known
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.
Patch / fix
- pypi copyparty 1.18.9
- 9001 copyparty 1.18.9
- copyparty_project copyparty 1.18.9
Is CVE-2025-54796 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- github.com https://github.com/9001/copyparty/security/advisories/GHSA-5662-2rj7-f2v6 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | copyparty | <1.18.9 |
1.18.9 |
Affected products
- 9001 copyparty
Classification
References
-
github.com
/9001/copyparty/commit/09910ba80784c3980947d92f45db696398c0fd83
web, patch
-
github.com
/9001/copyparty/security/advisories/GHSA-5662-2rj7-f2v6
exploit, web, vendor-advisory
-
github.com
/9001/copyparty/releases/tag/v1.18.9
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2025-54796
advisory
-
github.com
/9001/copyparty
package
-
pypi.org
/project/copyparty
package
-
github.com
/advisories/GHSA-5662-2rj7-f2v6
advisory
Sources
- CVE List CVE-2025-54796
- GitHub Advisory GHSA-5662-2rj7-f2v6
- NVD CVE-2025-54796
- OSV PYSEC-2026-1275
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.