CVE-2026-41511 OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle

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...

Infinite loop

Overview OpenMcdf is a fully .NET / C library to manipulate Compound File Binary File Format files, also known as Structured Storage. Affected versions of this package are vulnerable to Infinite loop through the MoveNext traversal logic in the directory tree enumeration code. An attacker can...

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...