{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.4.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "814d4e1f744fe709bdb4f5e9d4c6c6bd54982e09"
            }
          ],
          "repo": "https://github.com/sync-in/server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jx63-h26r-8cph"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58270.json"
  },
  "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.",
  "id": "CVE-2026-58270",
  "modified": "2026-09-23T03:31:05.614243418Z",
  "published": "2026-09-21T20:28:53.535Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`"
}