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    CVE-2026-41511

    OpenMcdf is a fully .NET / C# library to manipulate Compound File Binary File Format files, also known as Structured Storage. Prior to version 3.1.3, OpenMcdf does not detect cycles in the directory entry red-black tree of a Compound File Binary (CFB) document. A crafted CFB file with a cycle in the LeftSiblingID / RightSiblingID chain causes Storage.EnumerateEntries() and Storage.OpenStream() to loop indefinitely, consuming the calling thread with no possibility of recovery via try/catch. This issue has been patched in version 3.1.3.

    Published:May 8, 2026
    Last Modified:Jun 5, 2026
    EPS:May 8, 2026
    EPSS Score:0.00013
    CVSS Score:6.2

    Affected Products

    Vendor
    Ironfede
    Product
    Openmcdf
    Vendor
    Openmcdf
    Product
    Openmcdf

    Exploits

    https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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