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

Quick assessment

Affected
openmcdf openmcdf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenMcdf是OpenMcdf团队的一个文档管理库。 OpenMcdf 3.1.4之前版本存在资源管理错误漏洞，该漏洞源于DirectoryTree.TryGetDirectoryEntry方法中的BST名称查找循环缺少循环检测，导致特制CFB文件可触发无限循环，造成不可恢复的拒绝服务。

CVSS 6.2 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
openmcdf openmcdf < 3.1.4 affected
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I. Basic Information for CVE-2026-45785

Vulnerability Information
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Vulnerability Title
OpenMcdf: Uncatchable infinite loop in DirectoryTree.TryGetDirectoryEntry on crafted CFB directory cycle
Source: CVE Program / CVE List V5
Vulnerability Description
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 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, and the bug is reachable from RootStorage.OpenStorage(name), TryOpenStorage(name), OpenStream(name), and TryOpenStream(name), causing an unrecoverable denial of service. This issue is fixed in version 3.1.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenMcdf 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenMcdf是OpenMcdf团队的一个文档管理库。 OpenMcdf 3.1.4之前版本存在资源管理错误漏洞，该漏洞源于DirectoryTree.TryGetDirectoryEntry方法中的BST名称查找循环缺少循环检测，导致特制CFB文件可触发无限循环，造成不可恢复的拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openmcdf openmcdf < 3.1.4 -

II. Public POCs for CVE-2026-45785

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III. Intelligence Information for CVE-2026-45785

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Patches & Fixes for CVE-2026-45785 (1)

Vendor Advisories for CVE-2026-45785 (1)

IV. Related Vulnerabilities

Same product: openmcdf
Same weakness: CWE-835

V. Comments for CVE-2026-45785

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