{"id":"CVE-2026-58270","summary":"Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`","details":"Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, the sync diff endpoint compiles a user-supplied string into a `RegExp` with no complexity validation. A catastrophic-backtracking pattern (e.g. `^(a+)+b`) blocks the Node.js event loop, making the entire server unresponsive to all users until the container is restarted. Version 2.4.0 patches the issue.","aliases":["GHSA-jx63-h26r-8cph"],"modified":"2026-09-22T11:45:33.957904783Z","published":"2026-09-21T20:28:53.535Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58270.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-1333"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58270.json"},{"type":"ADVISORY","url":"https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58270"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/sync-in/server","events":[{"introduced":"0"},{"fixed":"814d4e1f744fe709bdb4f5e9d4c6c6bd54982e09"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"2.4.0"}]}}],"versions":["v2.3.0","v2.2.1","v2.2.0","v2.1.0","v2.0.0","v1.11.0","v1.10.1","v1.10.0","v1.9.6","v1.9.5","v1.9.4","v1.9.3","v1.9.2","v1.9.1","v1.9.0","v1.8.1","v1.8.0","v1.7.0","v1.6.1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.0","v1.3.9","v1.3.8","v1.3.7","v1.3.6","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.2","v1.2.1","v1.2.0","v1.1.1","v1.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58270.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}