{"id":"CVE-2025-54796","aliases":["GHSA-5662-2rj7-f2v6","PYSEC-2026-1275"],"title":"copyparty allows Regex Denial of Service (ReDoS) in the upload listing","summary":"copyparty allows Regex Denial of Service (ReDoS) in the upload listing","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"copyparty","product":"copyparty","ecosystem":"pip","affected":["copyparty < 1.18.9"],"patched":["copyparty 1.18.9"],"published":"2025-08-04","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:26.743035993Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-5662-2rj7-f2v6","references":[{"url":"https://github.com/9001/copyparty/security/advisories/GHSA-5662-2rj7-f2v6"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-54796"},{"url":"https://github.com/9001/copyparty/commit/09910ba80784c3980947d92f45db696398c0fd83"},{"url":"https://github.com/9001/copyparty"},{"url":"https://github.com/9001/copyparty/releases/tag/v1.18.9"}],"tags":["osv","pip"],"epss":0.00417,"epssPercentile":0.33253,"ingestedAt":"2026-07-08T18:25:45.793Z","slug":"CVE-2025-54796","body":"## Overview\n\n### Summary\nThe `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.\n\n### PoC\n`https://127.0.0.1:3923/?ru&filter=(.+)+x`\n\n### Impact\nThe server becomes fully inaccessible for a long time.\n\n## Affected packages\n\n- `copyparty < 1.18.9`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `copyparty 1.18.9`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}