CVE-2026-58270— Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`
Quick assessment
Affected
Sync-in server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 with no complexity validation. A catastrophic-backtracking pattern (e.g. ) bl
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I. Basic Information for CVE-2026-58270
Vulnerability Information
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Vulnerability Title
Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-58270
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Other References for CVE-2026-58270 (1)
Same Patch Batch · Sync-in · 2026-09-21 · 4 CVEs total
| CVE-2026-58269 | 8.1 HIGH | Sync-in Server has a complete 2FA Bypass via `POST /api/auth/token` |
| CVE-2026-58271 | 6.8 MEDIUM | @sync-in/server vulnerable to TOTP Brute-Force via `POST /api/app/sync/register` |
| CVE-2026-58272 | 5.3 MEDIUM | Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/lo |
IV. Related Vulnerabilities
Same product: server
Same vendor: Sync-in
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CVE-2026-58272
Sync-in Server has Username/Login Enumeration via Timing Sid -
CVE-2026-58269
Sync-in Server has a complete 2FA Bypass via `POST /api/auth -
CVE-2026-58271
@sync-in/server vulnerable to TOTP Brute-Force via `POST /ap -
CVE-2026-47684
Sync-in Server: SSRF protection bypass via IPv4-mapped IPv6 -
CVE-2026-41161
Username Enumeration via Timing Attack
Same weakness: CWE-1333
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CVE-2026-89407
jackson-core: quadratic backtracking in NumberInput.PATTERN_ -
CVE-2026-93761
Denial of service via unbounded regex matching in Mongoid's -
CVE-2026-63460
Vendure: Unauthenticated ReDoS via `regex` filter on SQLite -
CVE-2026-92599
Joi before 17.13.7 and 18.2.6 ReDoS via isoDate -
CVE-2026-92114
a2ui-project a2ui Basic Catalog safe_regex.ts redos
V. Comments for CVE-2026-58270
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