GHSA-5QWM-7PVP-W988 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 -...