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    CVE-2026-58270

    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.

    Published:Sep 21, 2026
    Last Modified:Sep 22, 2026
    EPS:Sep 21, 2026
    EPSS Score:0.00289
    CVSS Score:6.5

    Affected Products

    Vendor
    Sync-in
    Product
    Server

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

    Related CVEs

    CVE-2026-58272 (CVSS 5.3) — Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Versions prio…
    CVE-2026-58269 (CVSS 8.1) — Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to vers…
    CVE-2026-58271 (CVSS 6.8) — Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to vers…
    CVE-2026-47684 (CVSS 7.7) — Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior …
    CVE-2026-41161 (CVSS 6.9) — Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior …
    CVE-2025-67438 (CVSS 6.1) — A Stored Cross-Site Scripting (XSS) vulnerability in Sync-in Server before 1.9.3 allows an authenticated attac…
    CVE-2025-56869 (CVSS 5.3) — Directory traversal vulnerability in Sync In server thru 1.1.1 allowing authenticated attackers to gain read a…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High