CVE-2026-45785
Medium · 6.2OpenMcdf: Uncatchable infinite loop in DirectoryTree.TryGetDirectoryEntry on crafted CFB directory cycle
CVSS
6.2
EPSS
0.2%
Published
May 19, 2026
CISA due date
—
The record
The BST name-lookup loop in `DirectoryTree.TryGetDirectoryEntry` (`OpenMcdf/DirectoryTree.cs:35-46`) walks directory entries by repeatedly calling `directories.TryGetSibling(child, siblingType, validateColor)`. A crafted CFB file with cyclic Left/Right sibling links among directory entries - constructed so the per-step BST-order check in `TryGetSibling` (`DirectoryEntries.cs:84-85`) is satisfied at every step - drives this `while (child is not null)` loop forever. There is no cycle detection in `TryGetDirectoryEntry`.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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