OpenMcdf: Uncatchable infinite loop in DirectoryTree.TryGetDirectoryEntry on crafted CFB directory cycle

Summary The BST name-lookup loop in DirectoryTree.TryGetDirectoryEntry OpenMcdf/DirectoryTree.cs:35-46 walks directory entries by repeatedly calling directories.TryGetSiblingchild, siblingType, validateColor. A crafted CFB file with cyclic Left/Right sibling links among directory entries -...

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...