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

Quick assessment

Affected
ironfede 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开源的一个用于操作复合文件二进制格式的.NET库。 OpenMcdf 3.1.3之前版本存在安全漏洞，该漏洞源于未检测目录条目红黑树中的循环，可能导致无限循环。

CVSS 6.2 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
ironfede openmcdf < 3.1.3 affected
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I. Basic Information for CVE-2026-41511

Vulnerability Information
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Vulnerability Title
OpenMcdf has an Infinite loop DoS via 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. 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 LeftSiblingID / RightSiblingID chain causes Storage.EnumerateEntries() and Storage.OpenStream() to loop indefinitely, consuming the calling thread with no possibility of recovery via try/catch. This issue has been patched in version 3.1.3.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenMcdf是OpenMcdf开源的一个用于操作复合文件二进制格式的.NET库。 OpenMcdf 3.1.3之前版本存在安全漏洞，该漏洞源于未检测目录条目红黑树中的循环，可能导致无限循环。
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
ironfede openmcdf < 3.1.3 -

II. Public POCs for CVE-2026-41511

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III. Intelligence Information for CVE-2026-41511

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Patches & Fixes for CVE-2026-41511 (1)

Vendor Advisories for CVE-2026-41511 (1)

Vendor Pages for CVE-2026-41511 (1)

IV. Related Vulnerabilities

Same product: openmcdf
Same weakness: CWE-835

V. Comments for CVE-2026-41511

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