CVE-2026-45785 OpenMcdf: Uncatchable infinite loop in DirectoryTree.TryGetDirectoryEntry on crafted CFB directory cycle

OpenMcdf is a fully .NET / C library to manipulate Compound File Binary File Format files, also known as Structured Storage. In 3.1.3 and earlier, the BST name-lookup loop in DirectoryTree.TryGetDirectoryEntry OpenMcdf/DirectoryTree.cs:35-46 walks directory entries by repeatedly calling...

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 -...