cyfenced.com →

[ CVE-2026-58270 · Published 21 Sep 2026 ]

Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`

CVSS 6.5 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

  • @sync-in/server 2.4.0Fixed version · GitHub Advisories · npm package @sync-in/server: upgrade to 2.4.0 or later (affected <= 2.3.0)

[ Packages ]Affected open-source packages

[ References ]References