CVE-2026-58270CWE-1333

CVE-2026-58270

Medium · published September 22, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
27.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00348 · 27.2th percentile
Weakness
CWE-1333 · Inefficient Regular Expression Complexity
Published
2026-09-22T01:17Z
References (2)
https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph · [email protected]https://github.com/Sync-in/server/security/advisories/GHSA-jx63-h26r-8cph · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 23 SEP 03:46Z
    EPSS moved — → 0%
    epss
  • 21 SEP 20:28Z
    Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`
    cvelistv5