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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
ironfede openmcdf affected
Version Status Constraints
< 3.1.3 affected —

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-jxpf-xq2m-q525 OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/openmcdf/openmcdf/commit/24f445a557fc4f46461cf6d02d296cce16c293a0 cve-icon cve-icon
https://github.com/openmcdf/openmcdf/releases/tag/v3.1.3 cve-icon cve-icon
https://github.com/openmcdf/openmcdf/security/advisories/GHSA-jxpf-xq2m-q525 cve-icon cve-icon
History

Fri, 08 May 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle
Weaknesses CWE-835
References
Metrics cvssV3_1

{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-08T18:52:39.438Z

Reserved: 2026-04-20T18:18:50.681Z

Link: CVE-2026-41511

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-08T19:16:31.363

Modified: 2026-05-08T19:16:31.363

Link: CVE-2026-41511

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-08T20:45:16Z

Weaknesses