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...

CVE-2026-41511

CVE-2026-41511 affects the OpenMcdf .NET/C# library for Compound File Binary (CFB) manipulation. Before version 3.1.3, the library failed to detect cycles in the directory-entry red–black tree, allowing a crafted CFB file to create a cycle in LeftSiblingID/RightSiblingID that causes Storage.Enume...

OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle

Summary 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 thre...