CVE-2026-41511

OpenMcdf has an Infinite loop DoS via crafted CFB directory cycle

Published May 8, 2026 CVSS 3.1 · 6.2 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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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
History
Type Values Removed Values Added
First Time appeared Openmcdf
Openmcdf openmcdf
CPEs cpe:2.3:a:openmcdf_project:openmcdf:*:*:*:*:*:*:*:* cpe:2.3:a:openmcdf:openmcdf:*:*:*:*:*:*:*:*
Vendors & Products Openmcdf Project
Openmcdf Project openmcdf
Openmcdf
Openmcdf openmcdf
Type Values Removed Values Added
First Time appeared Openmcdf Project
Openmcdf Project openmcdf
CPEs cpe:2.3:a:openmcdf_project:openmcdf:*:*:*:*:*:*:*:*
Vendors & Products Openmcdf Project
Openmcdf Project openmcdf
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Ironfede
Ironfede openmcdf
Vendors & Products Ironfede
Ironfede openmcdf
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 11, 2026, 6:45 PM
Reserved
Apr 20, 2026, 6:18 PM
Status
Analyzed
Published
May 8, 2026, 7:16 PM
Modified
Oct 26, 2026, 6:10 PM